Update licensing to MPL-2.0 + Palimpsest

- LICENSE: MPL-2.0 with Palimpsest notice
- Added PALIMPSEST.adoc philosophy document
- Updated README badges
- Updated workflow SPDX headers to MPL-2.0

Legal license: MPL-2.0
Philosophical framework: Palimpsest (not yet legally binding)
Future: Palimpsest v0.5+ will integrate MPL-2.0

🤖 Generated with Claude Code

Author: Jonathan D.A. Jewell

.github/workflows/codeql.yml

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: MPL-2.0
 # 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: MPL-2.0
 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: MPL-2.0
 # 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: MPL-2.0
 # Sample workflow for building and deploying a Jekyll site to GitHub Pages
 name: Deploy Jekyll with GitHub Pages dependencies preinstalled
 

.github/workflows/mirror.yml

@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: AGPL-3.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # SPDX-FileCopyrightText: 2025 Jonathan D.A. Jewell
 name: Mirror to Git Forges
 

.github/workflows/quality.yml

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: MPL-2.0
 name: Code Quality
 on: [push, pull_request]
 

.github/workflows/rsr-antipattern.yml

@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: AGPL-3.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 name: RSR Language Policy
 
 on:

.github/workflows/scorecard-enforcer.yml

@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: AGPL-3.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # 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: MPL-2.0
 name: OSSF Scorecard
 on:
   push:

.github/workflows/secret-scanner.yml

@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: AGPL-3.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # Prevention workflow - scans for hardcoded secrets before they reach main
 name: Secret Scanner