chore: fix license headers to PMPL-1.0-or-later

- Update SPDX identifiers from AGPL to PMPL
- Ensure LICENSE file uses PMPL-1.0-or-later
- Maintain consistency with palimpsest-license repo

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: Your Name

.github/workflows/codeql.yml

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: PMPL-1.0-or-later
 # For most projects, this workflow file will not need changing; you simply need
 # to commit it to your repository.
 #

.github/workflows/guix-nix-policy.yml

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: PMPL-1.0-or-later
 name: Guix/Nix Package Policy
 on: [push, pull_request]
 jobs:

.github/workflows/instant-sync.yml

@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: AGPL-3.0-or-later
+# SPDX-License-Identifier: PMPL-1.0-or-later
 # Instant Forge Sync - Triggers propagation to all forges on push/release
 name: Instant Sync
 

.github/workflows/jekyll-gh-pages.yml

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: PMPL-1.0-or-later
 # Sample workflow for building and deploying a Jekyll site to GitHub Pages
 name: Deploy Jekyll with GitHub Pages dependencies preinstalled
 

.github/workflows/jekyll.yml

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: PMPL-1.0-or-later
 # This workflow uses actions that are not certified by GitHub.
 # They are provided by a third-party and are governed by
 # separate terms of service, privacy policy, and support

.github/workflows/mirror.yml

@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: AGPL-3.0-or-later
+# SPDX-License-Identifier: PMPL-1.0-or-later
 name: Mirror to GitLab and Bitbucket
 
 on:

.github/workflows/quality.yml

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: PMPL-1.0-or-later
 name: Code Quality
 on: [push, pull_request]
 

.github/workflows/rsr-antipattern.yml

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: PMPL-1.0-or-later
 # RSR Anti-Pattern CI Check
 # SPDX-License-Identifier: AGPL-3.0-or-later
 #

.github/workflows/scorecard-enforcer.yml

@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: AGPL-3.0-or-later
+# SPDX-License-Identifier: PMPL-1.0-or-later
 # Prevention workflow - runs OpenSSF Scorecard and fails on low scores
 name: OpenSSF Scorecard Enforcer
 

.github/workflows/scorecard.yml

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: PMPL-1.0-or-later
 name: OSSF Scorecard
 on:
   push: