chore(hygiene): add missing SPDX headers, fix stale links + katagoria invariant

Deep-checkpoint safe fixes only. No CI/workflow YAML, no architecture
changes, no deletions — ambiguous/template-instantiation items are left
for the maintainer (see OQ-001/OQ-002 and issues #32, #35-#42).

SPDX headers (MPL-2.0) added to 7 files that lacked them:
- session/dispatch.sh, session/local-hooks.sh, scripts/invariant-path.sh,
  .machine_readable/scripts/forge/git-cleanup.sh (after the shebang)
- .editorconfig (also corrects the stale "RSR-template-repo" identity
  string in its header comment to "nextgen-typing")
- .machine_readable/6a2/0-AI-MANIFEST.a2ml,
  .machine_readable/6a2/anchor/0-AI-MANIFEST.a2ml (matching the sibling
  6a2 STATE/META header convention)

Broken internal links fixed (target exists under a different name):
- GOVERNANCE.adoc, MAINTAINERS.adoc: CONTRIBUTING.adoc -> CONTRIBUTING.md
- docs/governance/CRG-CRITERIA.adoc: READINESS.adoc -> ../../READINESS.md

Factual correction:
- 0-AI-MANIFEST.a2ml invariant #4 said "katagoria does not exist yet",
  contradicting EXPLAINME.adoc, ROADMAP.adoc (marked [x] done with
  landed research artefacts), and 6a2/{ECOSYSTEM,META}.a2ml (all record
  it created 2026-04-11, active). Corrected the agent-bootstrap manifest
  to match the five concurring sources.

https://claude.ai/code/session_01BwV2DWsjkBiNP3oscimMLV

Author: claude

.editorconfig

@@ -1,4 +1,6 @@
-# RSR-template-repo - Editor Configuration
+# SPDX-License-Identifier: MPL-2.0
+# Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath) <j.d.a.jewell@open.ac.uk>
+# nextgen-typing - Editor Configuration
 # https://editorconfig.org
 
 root = true

.machine_readable/6a2/0-AI-MANIFEST.a2ml

@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: MPL-2.0
+# Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath) <j.d.a.jewell@open.ac.uk>
+#
 # AI Manifest for 6a2 Directory
 
 ## Purpose

.machine_readable/6a2/anchor/0-AI-MANIFEST.a2ml

@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: MPL-2.0
+# Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath) <j.d.a.jewell@open.ac.uk>
+#
 # AI Manifest for Anchor Directory
 
 ## Purpose

.machine_readable/scripts/forge/git-cleanup.sh

@@ -1,4 +1,6 @@
 #!/usr/bin/env bash
+# SPDX-License-Identifier: MPL-2.0
+# Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath) <j.d.a.jewell@open.ac.uk>
 # git-cleanup.sh — Repository hygiene script
 set -euo pipefail
 echo "Cleaning up merged branches..."

0-AI-MANIFEST.a2ml

@@ -17,7 +17,9 @@ Pipeline:  katagoria → typell → typed-wasm → PanLL
    See typed-wasm ADR-004.
 3. **No compiler claims here** — correctness/proof/benchmark claims are made
    in constituent repos, never in this coordination layer.
-4. **katagoria does not exist yet** — do not assume files exist there.
+4. **katagoria is the research-origination upstream** — created 2026-04-11 and
+   active in the pipeline (see ECOSYSTEM.a2ml / META.a2ml / ROADMAP.adoc). This
+   coordination repo documents it but does not own it.
 
 ## Canonical Locations
 

GOVERNANCE.adoc

@@ -148,7 +148,7 @@ Changes to this document require the same process as Significant Changes above.
 
 * link:MAINTAINERS.adoc[Maintainers]
 * link:CODE_OF_CONDUCT.md[Code of Conduct]
-* link:CONTRIBUTING.adoc[Contributing Guide]
+* link:CONTRIBUTING.md[Contributing Guide]
 * link:https://github.com/hyperpolymath/standards/blob/main/LICENCE-POLICY.adoc[Estate License Policy]
 * link:https://github.com/hyperpolymath/standards[rhodium-standard-repositories (TPCF)]
 

MAINTAINERS.adoc

@@ -62,4 +62,4 @@ For questions about project governance:
 
 * link:GOVERNANCE.adoc[Governance Model]
 * link:CODE_OF_CONDUCT.md[Code of Conduct]
-* link:CONTRIBUTING.adoc[Contributing Guide]
+* link:CONTRIBUTING.md[Contributing Guide]

docs/governance/CRG-CRITERIA.adoc

@@ -38,4 +38,4 @@ This document defines the quality assessment criteria for individual project com
 6. Has it been tested on 6+ diverse external targets? (Broad → **B**)
 7. Do external users confirm it works and is useful? (Field-proven → **A**)
 
-See link:READINESS.adoc[READINESS.adoc] for the current project assessment.
+See link:../../READINESS.md[READINESS.md] for the current project assessment.

scripts/invariant-path.sh

@@ -1,4 +1,6 @@
 #!/usr/bin/env bash
+# SPDX-License-Identifier: MPL-2.0
+# Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath) <j.d.a.jewell@open.ac.uk>
 set -euo pipefail
 
 SCRIPT_DIR="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"

session/dispatch.sh

@@ -1,4 +1,6 @@
 #!/usr/bin/env bash
+# SPDX-License-Identifier: MPL-2.0
+# Copyright (c) 2026 Jonathan D.A. Jewell (hyperpolymath) <j.d.a.jewell@open.ac.uk>
 set -euo pipefail
 
 if [ "$#" -lt 3 ]; then