diff --git a/.gitattributes b/.gitattributes
index bb56184..e860a85 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # RSR-compliant .gitattributes
 
 * text=auto eol=lf
diff --git a/.github/workflows/boj-build.yml b/.github/workflows/boj-build.yml
index ddeab5d..712beb3 100644
--- a/.github/workflows/boj-build.yml
+++ b/.github/workflows/boj-build.yml
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 name: BoJ Server Build Trigger
 on:
   push:
diff --git a/.github/workflows/casket-pages.yml b/.github/workflows/casket-pages.yml
index dee6a46..1839b7b 100644
--- a/.github/workflows/casket-pages.yml
+++ b/.github/workflows/casket-pages.yml
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 name: GitHub Pages
 
 on:
diff --git a/.github/workflows/dependabot-automerge.yml b/.github/workflows/dependabot-automerge.yml
index be5c67f..ca86baa 100644
--- a/.github/workflows/dependabot-automerge.yml
+++ b/.github/workflows/dependabot-automerge.yml
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 #
 # dependabot-automerge.yml — enable GitHub's native auto-merge on
 # Dependabot pull requests that match a declared severity / ecosystem
diff --git a/.github/workflows/dogfood-gate.yml b/.github/workflows/dogfood-gate.yml
index 3535c7e..582f3ee 100644
--- a/.github/workflows/dogfood-gate.yml
+++ b/.github/workflows/dogfood-gate.yml
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath) <j.d.a.jewell@open.ac.uk>
 #
 # dogfood-gate.yml — Hyperpolymath Dogfooding Quality Gate
diff --git a/.github/workflows/governance.yml b/.github/workflows/governance.yml
index f5a4ce3..698d7e2 100644
--- a/.github/workflows/governance.yml
+++ b/.github/workflows/governance.yml
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # governance.yml — single wrapper calling the shared estate governance bundle
 # in hyperpolymath/standards instead of carrying per-repo copies.
 #
diff --git a/.github/workflows/scorecard-enforcer.yml b/.github/workflows/scorecard-enforcer.yml
index af0bef8..295e009 100644
--- a/.github/workflows/scorecard-enforcer.yml
+++ b/.github/workflows/scorecard-enforcer.yml
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # Prevention workflow - runs OpenSSF Scorecard and fails on low scores
 name: OpenSSF Scorecard Enforcer
 
diff --git a/.gitignore b/.gitignore
index 06fe1b0..73f3573 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # RSR-compliant .gitignore
 
 # OS & Editor
diff --git a/.machine_readable/6a2/AGENTIC.a2ml b/.machine_readable/6a2/AGENTIC.a2ml
index 09aa2c2..4a98976 100644
--- a/.machine_readable/6a2/AGENTIC.a2ml
+++ b/.machine_readable/6a2/AGENTIC.a2ml
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath) <j.d.a.jewell@open.ac.uk>
 #
 # AGENTIC.a2ml — AI agent constraints and capabilities
diff --git a/.machine_readable/6a2/ECOSYSTEM.a2ml b/.machine_readable/6a2/ECOSYSTEM.a2ml
index d75ee4a..d9d76f3 100644
--- a/.machine_readable/6a2/ECOSYSTEM.a2ml
+++ b/.machine_readable/6a2/ECOSYSTEM.a2ml
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # ECOSYSTEM.a2ml — Ecosystem position
 # Converted from ECOSYSTEM.scm on 2026-03-15
 
diff --git a/.machine_readable/6a2/META.a2ml b/.machine_readable/6a2/META.a2ml
index e187747..416c778 100644
--- a/.machine_readable/6a2/META.a2ml
+++ b/.machine_readable/6a2/META.a2ml
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # META.a2ml — Project meta-information
 # Converted from META.scm on 2026-03-15
 
diff --git a/.machine_readable/6a2/NEUROSYM.a2ml b/.machine_readable/6a2/NEUROSYM.a2ml
index ce0c930..767d7dd 100644
--- a/.machine_readable/6a2/NEUROSYM.a2ml
+++ b/.machine_readable/6a2/NEUROSYM.a2ml
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath) <j.d.a.jewell@open.ac.uk>
 #
 # NEUROSYM.a2ml — Neurosymbolic integration metadata
diff --git a/.machine_readable/6a2/PLAYBOOK.a2ml b/.machine_readable/6a2/PLAYBOOK.a2ml
index 02c3acb..a961250 100644
--- a/.machine_readable/6a2/PLAYBOOK.a2ml
+++ b/.machine_readable/6a2/PLAYBOOK.a2ml
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath) <j.d.a.jewell@open.ac.uk>
 #
 # PLAYBOOK.a2ml — Operational playbook
diff --git a/.machine_readable/6a2/STATE.a2ml b/.machine_readable/6a2/STATE.a2ml
index 6dea289..f4b311f 100644
--- a/.machine_readable/6a2/STATE.a2ml
+++ b/.machine_readable/6a2/STATE.a2ml
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # STATE.a2ml — Project state checkpoint
 # Converted from STATE.scm on 2026-03-15
 
diff --git a/.machine_readable/ADJUST.contractile b/.machine_readable/ADJUST.contractile
index fbfed52..527ce67 100644
--- a/.machine_readable/ADJUST.contractile
+++ b/.machine_readable/ADJUST.contractile
@@ -1,4 +1,4 @@
-; SPDX-License-Identifier: PMPL-1.0-or-later
+; SPDX-License-Identifier: MPL-2.0
 ; ADJUST.contractile — Accessibility invariants for tree-navigator
 ; "ADJUST" = Accessibility & Digital Justice for Universal Software & Technology
 ;
diff --git a/.machine_readable/CLADE.a2ml b/.machine_readable/CLADE.a2ml
index 712d794..9b448fb 100644
--- a/.machine_readable/CLADE.a2ml
+++ b/.machine_readable/CLADE.a2ml
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # Clade declaration — part of the gv-clade-index registry
 # See: https://github.com/hyperpolymath/gv-clade-index
 
diff --git a/.machine_readable/INTENT.contractile b/.machine_readable/INTENT.contractile
index 577d54e..eb07ad6 100644
--- a/.machine_readable/INTENT.contractile
+++ b/.machine_readable/INTENT.contractile
@@ -1,4 +1,4 @@
-; SPDX-License-Identifier: PMPL-1.0-or-later
+; SPDX-License-Identifier: MPL-2.0
 ; INTENT.contractile — Purpose and scope for tree-navigator
 ; Helps LLM/SLM agents understand what this repo IS and IS NOT.
 ;
diff --git a/.machine_readable/MUST.contractile b/.machine_readable/MUST.contractile
index faf6449..5e1e43e 100644
--- a/.machine_readable/MUST.contractile
+++ b/.machine_readable/MUST.contractile
@@ -1,4 +1,4 @@
-; SPDX-License-Identifier: PMPL-1.0-or-later
+; SPDX-License-Identifier: MPL-2.0
 ; MUST.contractile — Baseline invariants for tree-navigator
 ; These constraints MUST NOT be violated. K9 validators enforce them.
 ;
diff --git a/.machine_readable/TRUST.contractile b/.machine_readable/TRUST.contractile
index cdc2087..f664546 100644
--- a/.machine_readable/TRUST.contractile
+++ b/.machine_readable/TRUST.contractile
@@ -1,4 +1,4 @@
-; SPDX-License-Identifier: PMPL-1.0-or-later
+; SPDX-License-Identifier: MPL-2.0
 ; TRUST.contractile — Trust boundaries for tree-navigator
 ; Defines what LLM/SLM agents are trusted to do without asking.
 ;
diff --git a/.machine_readable/agent_instructions/README.adoc b/.machine_readable/agent_instructions/README.adoc
index 0ed360b..9bc2e24 100644
--- a/.machine_readable/agent_instructions/README.adoc
+++ b/.machine_readable/agent_instructions/README.adoc
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: PMPL-1.0-or-later
+// SPDX-License-Identifier: MPL-2.0
 // Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath) <j.d.a.jewell@open.ac.uk>
 = Agent Instructions
 :toc: preamble
diff --git a/.machine_readable/agent_instructions/coverage.a2ml b/.machine_readable/agent_instructions/coverage.a2ml
index 3d720dc..6979664 100644
--- a/.machine_readable/agent_instructions/coverage.a2ml
+++ b/.machine_readable/agent_instructions/coverage.a2ml
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath) <j.d.a.jewell@open.ac.uk>
 #
 # coverage.a2ml — Session coverage tracking
diff --git a/.machine_readable/agent_instructions/debt.a2ml b/.machine_readable/agent_instructions/debt.a2ml
index f46451a..c0238c5 100644
--- a/.machine_readable/agent_instructions/debt.a2ml
+++ b/.machine_readable/agent_instructions/debt.a2ml
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath) <j.d.a.jewell@open.ac.uk>
 #
 # debt.a2ml — Meander debt list
diff --git a/.machine_readable/agent_instructions/methodology.a2ml b/.machine_readable/agent_instructions/methodology.a2ml
index 9bf1439..754f357 100644
--- a/.machine_readable/agent_instructions/methodology.a2ml
+++ b/.machine_readable/agent_instructions/methodology.a2ml
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath) <j.d.a.jewell@open.ac.uk>
 #
 # methodology.a2ml — AI agent methodology configuration
diff --git a/.machine_readable/contractiles/bust/Bustfile.a2ml b/.machine_readable/contractiles/bust/Bustfile.a2ml
index 1c36305..1cc7824 100644
--- a/.machine_readable/contractiles/bust/Bustfile.a2ml
+++ b/.machine_readable/contractiles/bust/Bustfile.a2ml
@@ -1,5 +1,5 @@
 // Bustfile.a2ml — meta-repo bust contractile (breakage / rollback)
-// SPDX-License-Identifier: PMPL-1.0-or-later
+// SPDX-License-Identifier: MPL-2.0
 
 Bust {
     name: "tree-navigator"
diff --git a/.machine_readable/contractiles/bust/bust.ncl b/.machine_readable/contractiles/bust/bust.ncl
index 3d9ab8b..fc8cb8c 100644
--- a/.machine_readable/contractiles/bust/bust.ncl
+++ b/.machine_readable/contractiles/bust/bust.ncl
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # Bust — error-handling / failure-recovery runner
 #
 # Pairs with: Bustfile.a2ml (same directory)
diff --git a/.machine_readable/contractiles/dust/Dustfile.a2ml b/.machine_readable/contractiles/dust/Dustfile.a2ml
index d7dfc19..0d619ee 100644
--- a/.machine_readable/contractiles/dust/Dustfile.a2ml
+++ b/.machine_readable/contractiles/dust/Dustfile.a2ml
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # Dustfile — Cleanup and Hygiene Contract
 
 [dustfile]
diff --git a/.machine_readable/contractiles/trust/Trustfile.a2ml b/.machine_readable/contractiles/trust/Trustfile.a2ml
index 0b27189..f2a4f95 100644
--- a/.machine_readable/contractiles/trust/Trustfile.a2ml
+++ b/.machine_readable/contractiles/trust/Trustfile.a2ml
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # Trustfile — Integrity and provenance verification
 # Author: Jonathan D.A. Jewell <j.d.a.jewell@open.ac.uk>
 
diff --git a/.machine_readable/integrations/feedback-o-tron.a2ml b/.machine_readable/integrations/feedback-o-tron.a2ml
index 1c473ae..5381604 100644
--- a/.machine_readable/integrations/feedback-o-tron.a2ml
+++ b/.machine_readable/integrations/feedback-o-tron.a2ml
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # Feedback-o-Tron Integration — Autonomous Bug Reporting
 
 [integration]
diff --git a/.machine_readable/integrations/proven.a2ml b/.machine_readable/integrations/proven.a2ml
index 6b3e805..9af33ff 100644
--- a/.machine_readable/integrations/proven.a2ml
+++ b/.machine_readable/integrations/proven.a2ml
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # Proven Integration — Formally Verified Safety Library
 
 [integration]
diff --git a/.machine_readable/integrations/verisimdb.a2ml b/.machine_readable/integrations/verisimdb.a2ml
index 2c8f8f5..164c522 100644
--- a/.machine_readable/integrations/verisimdb.a2ml
+++ b/.machine_readable/integrations/verisimdb.a2ml
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # VeriSimDB Feed — Cross-Repo Analytics Data Store
 
 [integration]
diff --git a/.machine_readable/integrations/vexometer.a2ml b/.machine_readable/integrations/vexometer.a2ml
index bb7fc43..238b3d2 100644
--- a/.machine_readable/integrations/vexometer.a2ml
+++ b/.machine_readable/integrations/vexometer.a2ml
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # Vexometer Integration — Irritation Surface Analysis
 
 [integration]
diff --git a/.machine_readable/svc/k9/README.adoc b/.machine_readable/svc/k9/README.adoc
index 137c184..9c3099f 100644
--- a/.machine_readable/svc/k9/README.adoc
+++ b/.machine_readable/svc/k9/README.adoc
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: PMPL-1.0-or-later
+// SPDX-License-Identifier: MPL-2.0
 = K9 Contractiles
 :toc: left
 :icons: font
diff --git a/.machine_readable/svc/k9/examples/ci-config.k9.ncl b/.machine_readable/svc/k9/examples/ci-config.k9.ncl
index 11fe019..9fe314e 100644
--- a/.machine_readable/svc/k9/examples/ci-config.k9.ncl
+++ b/.machine_readable/svc/k9/examples/ci-config.k9.ncl
@@ -1,5 +1,5 @@
 K9!
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # Example Yard-level K9 component: CI/CD configuration with validation
 # Security Level: Yard (Nickel evaluation, contract validation)
 # Signature recommended but not required
diff --git a/.machine_readable/svc/k9/examples/project-metadata.k9.ncl b/.machine_readable/svc/k9/examples/project-metadata.k9.ncl
index 64d5f66..14e0627 100644
--- a/.machine_readable/svc/k9/examples/project-metadata.k9.ncl
+++ b/.machine_readable/svc/k9/examples/project-metadata.k9.ncl
@@ -1,5 +1,5 @@
 K9!
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # Example Kennel-level K9 component: Project metadata
 # Security Level: Kennel (pure data, no execution)
 # No signature required
diff --git a/.machine_readable/svc/k9/examples/setup-repo.k9.ncl b/.machine_readable/svc/k9/examples/setup-repo.k9.ncl
index 66b046b..b635d5b 100644
--- a/.machine_readable/svc/k9/examples/setup-repo.k9.ncl
+++ b/.machine_readable/svc/k9/examples/setup-repo.k9.ncl
@@ -1,5 +1,5 @@
 K9!
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # Example Hunt-level K9 component: Repository setup automation
 # Security Level: Hunt (full execution with Just recipes)
 # ⚠️ SIGNATURE REQUIRED - DO NOT RUN WITHOUT VERIFICATION
diff --git a/.machine_readable/svc/k9/template-hunt.k9.ncl b/.machine_readable/svc/k9/template-hunt.k9.ncl
index 0814c8d..b3fcb47 100644
--- a/.machine_readable/svc/k9/template-hunt.k9.ncl
+++ b/.machine_readable/svc/k9/template-hunt.k9.ncl
@@ -1,5 +1,5 @@
 K9!
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # K9 Hunt-level template: Full execution with Just recipes
 # Security Level: Hunt (full system access)
 # ⚠️ SIGNATURE REQUIRED - Review carefully before use
diff --git a/.machine_readable/svc/k9/template-kennel.k9.ncl b/.machine_readable/svc/k9/template-kennel.k9.ncl
index c78e27d..4228b26 100644
--- a/.machine_readable/svc/k9/template-kennel.k9.ncl
+++ b/.machine_readable/svc/k9/template-kennel.k9.ncl
@@ -1,5 +1,5 @@
 K9!
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # K9 Kennel-level template: Pure data configuration
 # Security Level: Kennel (data-only, no execution)
 # No signature required - safe for any use
diff --git a/.machine_readable/svc/k9/template-yard.k9.ncl b/.machine_readable/svc/k9/template-yard.k9.ncl
index 75e5d89..a723f5a 100644
--- a/.machine_readable/svc/k9/template-yard.k9.ncl
+++ b/.machine_readable/svc/k9/template-yard.k9.ncl
@@ -1,5 +1,5 @@
 K9!
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # K9 Yard-level template: Configuration with validation
 # Security Level: Yard (Nickel evaluation with contracts)
 # Signature recommended but not required
diff --git a/.well-known/ai.txt b/.well-known/ai.txt
index 6668d66..cc7cbc3 100644
--- a/.well-known/ai.txt
+++ b/.well-known/ai.txt
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # ai.txt - AI interaction policy
 # See: https://site.spawning.ai/spawning-ai-txt
 
diff --git a/.well-known/humans.txt b/.well-known/humans.txt
index a558f15..5423d9e 100644
--- a/.well-known/humans.txt
+++ b/.well-known/humans.txt
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # humanstxt.org
 
 /* TEAM */
diff --git a/.well-known/security.txt b/.well-known/security.txt
index d3c11b2..8e9d493 100644
--- a/.well-known/security.txt
+++ b/.well-known/security.txt
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # RFC 9116 - security.txt
 # https://securitytxt.org/
 
diff --git a/CODE_OF_CONDUCT.md b/CODE_OF_CONDUCT.md
index c32021a..1f1548c 100644
--- a/CODE_OF_CONDUCT.md
+++ b/CODE_OF_CONDUCT.md
@@ -1,4 +1,4 @@
-<!-- SPDX-License-Identifier: PMPL-1.0-or-later -->
+<!-- SPDX-License-Identifier: MPL-2.0 -->
 # Contributor Covenant Code of Conduct
 
 ## Our Pledge
diff --git a/EXPLAINME.adoc b/EXPLAINME.adoc
index 6e50bea..bf33908 100644
--- a/EXPLAINME.adoc
+++ b/EXPLAINME.adoc
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: PMPL-1.0-or-later
+// SPDX-License-Identifier: MPL-2.0
 = 🌲 Tree Navigator — Show Me The Receipts
 :toc:
 :icons: font
diff --git a/Mustfile b/Mustfile
index 4f5e24e..5f07541 100644
--- a/Mustfile
+++ b/Mustfile
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # Mustfile - hyperpolymath mandatory checks
 # See: https://github.com/hyperpolymath/mustfile
 
diff --git a/PALIMPSEST.adoc b/PALIMPSEST.adoc
index e40e76c..84c8482 100644
--- a/PALIMPSEST.adoc
+++ b/PALIMPSEST.adoc
@@ -26,7 +26,7 @@ ethical-use, provenance, and lineage requirements.
 
 1. Include the PMPL-1.0 license text in `LICENSE`.
 2. Add SPDX headers to source files:
-   `SPDX-License-Identifier: PMPL-1.0-or-later`
+   `SPDX-License-Identifier: MPL-2.0`
 3. Add a Palimpsest badge to your README (see `assets/badges/` and `embed/license-blocks/`).
 
 == Versioning
diff --git a/QUICKSTART-DEV.adoc b/QUICKSTART-DEV.adoc
index 2069f79..89da4a7 100644
--- a/QUICKSTART-DEV.adoc
+++ b/QUICKSTART-DEV.adoc
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: PMPL-1.0-or-later
+// SPDX-License-Identifier: MPL-2.0
 // Template: QUICKSTART-DEV.adoc — clone → build → test → PR
 // Replace tree-navigator, {{BUILD_CMD}}, {{TEST_CMD}}, {{LANG_STACK}} with actuals
 = tree-navigator — Quick Start for Developers
diff --git a/QUICKSTART-MAINTAINER.adoc b/QUICKSTART-MAINTAINER.adoc
index 3a36483..a5457ac 100644
--- a/QUICKSTART-MAINTAINER.adoc
+++ b/QUICKSTART-MAINTAINER.adoc
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: PMPL-1.0-or-later
+// SPDX-License-Identifier: MPL-2.0
 // Template: QUICKSTART-MAINTAINER.adoc — packaging, deploying, and maintaining
 // Replace tree-navigator, {{PACKAGE_NAME}}, {{DEPS}} with actuals
 = tree-navigator — Quick Start for Platform Maintainers
diff --git a/QUICKSTART-USER.adoc b/QUICKSTART-USER.adoc
index bf96273..702e193 100644
--- a/QUICKSTART-USER.adoc
+++ b/QUICKSTART-USER.adoc
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: PMPL-1.0-or-later
+// SPDX-License-Identifier: MPL-2.0
 // Template: QUICKSTART-USER.adoc — 5-minute path to working software
 // Replace tree-navigator, Tree Navigator — See README.adoc for details., just run, Tree Navigator started successfully. with actuals
 = tree-navigator — Quick Start for Users
diff --git a/ROADMAP.adoc b/ROADMAP.adoc
index a2aeefb..42642a0 100644
--- a/ROADMAP.adoc
+++ b/ROADMAP.adoc
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: PMPL-1.0-or-later
+// SPDX-License-Identifier: MPL-2.0
 = Tree Navigator Roadmap
 
 == Current Status
diff --git a/RSR_OUTLINE.adoc b/RSR_OUTLINE.adoc
index 6e9f598..3ce20ed 100644
--- a/RSR_OUTLINE.adoc
+++ b/RSR_OUTLINE.adoc
@@ -209,7 +209,7 @@ This template is part of:
 
 == License
 
-SPDX-License-Identifier: PMPL-1.0-or-later-or-later
+SPDX-License-Identifier: MPL-2.0-or-later
 
 == Links
 
diff --git a/TOPOLOGY.md b/TOPOLOGY.md
index 0190b1d..737f023 100644
--- a/TOPOLOGY.md
+++ b/TOPOLOGY.md
@@ -1,4 +1,4 @@
-<!-- SPDX-License-Identifier: PMPL-1.0-or-later -->
+<!-- SPDX-License-Identifier: MPL-2.0 -->
 <!-- TOPOLOGY.md — Project architecture map and completion dashboard -->
 <!-- Last updated: 2026-02-19 -->
 
diff --git a/contractile.just b/contractile.just
index 8f99137..9a5827b 100644
--- a/contractile.just
+++ b/contractile.just
@@ -2,7 +2,7 @@
 # Source directory: contractiles
 # Re-generate with: contractile gen-just --dir contractiles
 #
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 
 # === DUST (Recovery & Rollback) ===
 # Source: Dustfile.a2ml
diff --git a/ffi/zig/build.zig b/ffi/zig/build.zig
index c2081bd..4a2e049 100644
--- a/ffi/zig/build.zig
+++ b/ffi/zig/build.zig
@@ -1,5 +1,5 @@
 // {{PROJECT}} FFI Build Configuration
-// SPDX-License-Identifier: PMPL-1.0-or-later
+// SPDX-License-Identifier: MPL-2.0
 
 const std = @import("std");
 
diff --git a/ffi/zig/src/main.zig b/ffi/zig/src/main.zig
index cbfe3df..d5e0155 100644
--- a/ffi/zig/src/main.zig
+++ b/ffi/zig/src/main.zig
@@ -3,7 +3,7 @@
 // This module implements the C-compatible FFI declared in src/abi/Foreign.idr
 // All types and layouts must match the Idris2 ABI definitions.
 //
-// SPDX-License-Identifier: PMPL-1.0-or-later
+// SPDX-License-Identifier: MPL-2.0
 
 const std = @import("std");
 
diff --git a/ffi/zig/test/integration_test.zig b/ffi/zig/test/integration_test.zig
index d66a302..0341994 100644
--- a/ffi/zig/test/integration_test.zig
+++ b/ffi/zig/test/integration_test.zig
@@ -1,5 +1,5 @@
 // {{PROJECT}} Integration Tests
-// SPDX-License-Identifier: PMPL-1.0-or-later
+// SPDX-License-Identifier: MPL-2.0
 //
 // These tests verify that the Zig FFI correctly implements the Idris2 ABI
 
diff --git a/guix.scm b/guix.scm
index 153e0a7..53821be 100644
--- a/guix.scm
+++ b/guix.scm
@@ -1,4 +1,4 @@
-; SPDX-License-Identifier: PMPL-1.0-or-later
+; SPDX-License-Identifier: MPL-2.0
 ;; guix.scm — GNU Guix package definition for tree-navigator
 ;; Usage: guix shell -f guix.scm
 
diff --git a/hooks/validate-codeql.sh b/hooks/validate-codeql.sh
index c435189..15b52c3 100755
--- a/hooks/validate-codeql.sh
+++ b/hooks/validate-codeql.sh
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # Pre-commit hook: Validate CodeQL language matrix matches repo
 set -euo pipefail
 
diff --git a/hooks/validate-permissions.sh b/hooks/validate-permissions.sh
index 50fce4f..1999b01 100755
--- a/hooks/validate-permissions.sh
+++ b/hooks/validate-permissions.sh
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # Pre-commit hook: Validate workflow permissions declarations
 set -euo pipefail
 ERRORS=0
diff --git a/hooks/validate-sha-pins.sh b/hooks/validate-sha-pins.sh
index c6d9913..697092b 100755
--- a/hooks/validate-sha-pins.sh
+++ b/hooks/validate-sha-pins.sh
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # Pre-commit hook: Validate GitHub Actions are SHA-pinned
 
 set -euo pipefail
diff --git a/hooks/validate-spdx.sh b/hooks/validate-spdx.sh
index 8f50002..cc81cf1 100755
--- a/hooks/validate-spdx.sh
+++ b/hooks/validate-spdx.sh
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # Pre-commit hook: Validate SPDX headers in workflow files
 
 set -euo pipefail
@@ -13,7 +13,7 @@ for workflow in .github/workflows/*.yml .github/workflows/*.yaml; do
     first_line=$(head -n1 "$workflow")
     if ! echo "$first_line" | grep -qE "$SPDX_PATTERN"; then
         echo "ERROR: Missing SPDX header in $workflow"
-        echo "  First line should be: # SPDX-License-Identifier: PMPL-1.0-or-later"
+        echo "  First line should be: # SPDX-License-Identifier: MPL-2.0"
         ERRORS=$((ERRORS + 1))
     fi
 done
diff --git a/setup.sh b/setup.sh
index 4679341..f878b68 100755
--- a/setup.sh
+++ b/setup.sh
@@ -1,5 +1,5 @@
 #!/bin/sh
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # setup.sh — Universal setup script for tree-navigator
 #
 # Detects your shell, platform, and installs prerequisites.
@@ -252,7 +252,7 @@ main() {
     # Write report
     REPORT_FILE="INSTALL-SECURITY-REPORT.adoc"
     {
-        printf "// SPDX-License-Identifier: PMPL-1.0-or-later\n"
+        printf "// SPDX-License-Identifier: MPL-2.0\n"
         printf "= Install Security Report\n"
         printf ":date: %s\n\n" "$(date -Iseconds 2>/dev/null || date)"
         printf "== Platform\n"
diff --git a/src/bookmarks.adb b/src/bookmarks.adb
index 56d52f5..34ae439 100644
--- a/src/bookmarks.adb
+++ b/src/bookmarks.adb
@@ -1,4 +1,4 @@
--- SPDX-License-Identifier: PMPL-1.0-or-later
+-- SPDX-License-Identifier: MPL-2.0
 -- Bookmark management implementation
 pragma Ada_2022;
 with Ada.Text_IO; use Ada.Text_IO;
diff --git a/src/bookmarks.ads b/src/bookmarks.ads
index 4bf2e9c..5b3f500 100644
--- a/src/bookmarks.ads
+++ b/src/bookmarks.ads
@@ -1,4 +1,4 @@
--- SPDX-License-Identifier: PMPL-1.0-or-later
+-- SPDX-License-Identifier: MPL-2.0
 -- Bookmark management with persistence
 pragma Ada_2022;
 with Ada.Calendar;
diff --git a/src/config.adb b/src/config.adb
index 0f18e4e..c35704a 100644
--- a/src/config.adb
+++ b/src/config.adb
@@ -1,4 +1,4 @@
--- SPDX-License-Identifier: PMPL-1.0-or-later
+-- SPDX-License-Identifier: MPL-2.0
 -- Configuration management implementation
 pragma Ada_2022;
 
diff --git a/src/config.ads b/src/config.ads
index c6400a4..eca2313 100644
--- a/src/config.ads
+++ b/src/config.ads
@@ -1,4 +1,4 @@
--- SPDX-License-Identifier: PMPL-1.0-or-later
+-- SPDX-License-Identifier: MPL-2.0
 -- Configuration management with strong typing
 pragma Ada_2022;
 
diff --git a/src/file_types.adb b/src/file_types.adb
index 1e5135a..c9ef27d 100644
--- a/src/file_types.adb
+++ b/src/file_types.adb
@@ -1,4 +1,4 @@
--- SPDX-License-Identifier: PMPL-1.0-or-later
+-- SPDX-License-Identifier: MPL-2.0
 -- File type detection implementation
 pragma Ada_2022;
 with Ada.Strings.Fixed;
diff --git a/src/file_types.ads b/src/file_types.ads
index f3b0e10..8b1f3c0 100644
--- a/src/file_types.ads
+++ b/src/file_types.ads
@@ -1,4 +1,4 @@
--- SPDX-License-Identifier: PMPL-1.0-or-later
+-- SPDX-License-Identifier: MPL-2.0
 -- File type detection and classification
 pragma Ada_2022;
 with Ada.Directories;
diff --git a/src/main.adb b/src/main.adb
index cd94220..9d0149c 100644
--- a/src/main.adb
+++ b/src/main.adb
@@ -1,4 +1,4 @@
--- SPDX-License-Identifier: PMPL-1.0-or-later
+-- SPDX-License-Identifier: MPL-2.0
 -- Tree Navigator — High-Assurance Directory Visualization.
 --
 -- This Ada 2022 module implements the primary logic for the `tn` utility.
diff --git a/src/navigator.adb b/src/navigator.adb
index 2bdfbeb..2a39638 100644
--- a/src/navigator.adb
+++ b/src/navigator.adb
@@ -1,4 +1,4 @@
--- SPDX-License-Identifier: PMPL-1.0-or-later
+-- SPDX-License-Identifier: MPL-2.0
 -- Interactive directory navigation implementation
 pragma Ada_2022;
 with Ada.Text_IO; use Ada.Text_IO;
diff --git a/src/navigator.ads b/src/navigator.ads
index e359475..5eb2663 100644
--- a/src/navigator.ads
+++ b/src/navigator.ads
@@ -1,4 +1,4 @@
--- SPDX-License-Identifier: PMPL-1.0-or-later
+-- SPDX-License-Identifier: MPL-2.0
 -- Interactive directory navigation
 pragma Ada_2022;
 
diff --git a/src/terminal.adb b/src/terminal.adb
index 0982ec5..f977b71 100644
--- a/src/terminal.adb
+++ b/src/terminal.adb
@@ -1,4 +1,4 @@
--- SPDX-License-Identifier: PMPL-1.0-or-later
+-- SPDX-License-Identifier: MPL-2.0
 -- Terminal utilities implementation
 pragma Ada_2022;
 with Ada.Text_IO; use Ada.Text_IO;
diff --git a/src/terminal.ads b/src/terminal.ads
index 9bf3af2..76cd6db 100644
--- a/src/terminal.ads
+++ b/src/terminal.ads
@@ -1,4 +1,4 @@
--- SPDX-License-Identifier: PMPL-1.0-or-later
+-- SPDX-License-Identifier: MPL-2.0
 -- Terminal utilities for colored output and user interaction
 pragma Ada_2022;
 
diff --git a/src/tree_printer.adb b/src/tree_printer.adb
index ade3fb3..58d0901 100644
--- a/src/tree_printer.adb
+++ b/src/tree_printer.adb
@@ -1,4 +1,4 @@
--- SPDX-License-Identifier: PMPL-1.0-or-later
+-- SPDX-License-Identifier: MPL-2.0
 -- Tree export engine implementation
 pragma Ada_2022;
 with Ada.Text_IO; use Ada.Text_IO;
diff --git a/src/tree_printer.ads b/src/tree_printer.ads
index 97cc5cb..bb4f5be 100644
--- a/src/tree_printer.ads
+++ b/src/tree_printer.ads
@@ -1,4 +1,4 @@
--- SPDX-License-Identifier: PMPL-1.0-or-later
+-- SPDX-License-Identifier: MPL-2.0
 -- Tree export engine for directory visualization
 pragma Ada_2022;
 with Ada.Strings.Unbounded; use Ada.Strings.Unbounded;
diff --git a/stapeln.toml b/stapeln.toml
index 0c0c994..f95119b 100644
--- a/stapeln.toml
+++ b/stapeln.toml
@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # stapeln.toml — Layer-based container build for tree-navigator
 #
 # stapeln builds containers as composable layers (German: "to stack").