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

@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: AGPL-3.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 name: CodeQL Security Analysis
 
 on:

.github/workflows/generator-generic-ossf-slsa3-publish.yml

@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: AGPL-3.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 # 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/guix-nix-policy.yml

@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: AGPL-3.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 name: Guix/Nix Package Policy
 
 on: [push, pull_request]

.github/workflows/haskell.yml

@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: AGPL-3.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 name: Haskell CI
 
 on:

.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/mirror.yml

@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: AGPL-3.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 name: Mirror to GitLab and Bitbucket
 
 on:

.github/workflows/npm-bun-blocker.yml

@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: AGPL-3.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 name: NPM/Bun Blocker
 
 on: [push, pull_request]

.github/workflows/php-security.yml

@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: AGPL-3.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 name: PHP Security Check
 
 on: [push, pull_request]

.github/workflows/quality.yml

@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: AGPL-3.0-or-later
+# 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: