Add missing schemas, extension examples, and documentation improvements

Phase 1: Missing Schema Files
- Create collaboration.schema.json with comments, changes, CRDT metadata
- Create forms.schema.json with all form block types and validation
- Create security.schema.json with signatures, encryption, access control

Phase 2: Extension Marks Integration
- Integrate semantic and academic marks into content.schema.json
- Update validation scripts for schema dependencies

Phase 3: Author/Person Standardization
- Add base Person definition with identifier field to anchor.schema.json
- Update extension schemas to use allOf composition
- Add ORCID recommendation for academic documents

Phase 4: Extension Examples
- Create academic-document/ with theorems, proofs, exercises, algorithms
- Create semantic-document/ with citations, footnotes, glossary
- Create forms-document/ with comprehensive form validation examples
- Create collaboration-document/ with comments, suggestions, track changes
- Create phantoms-document/ with multi-scope annotation clusters

Phase 5: Documentation
- Add terminology glossary and Person docs to anchors spec
- Create spec/extensions/README.md with compatibility matrix
- Document extension policies in schemas/README.md
- Add conditional validation docs to forms extension
- Add CI and license badges to README

Author: gvonness-apolitical

README.md

@@ -1,5 +1,8 @@
 # Codex Document Format
 
+[![Validate Schemas](https://github.com/gvonness-apolitical/codex-file-format-spec/actions/workflows/validate-schemas.yml/badge.svg)](https://github.com/gvonness-apolitical/codex-file-format-spec/actions/workflows/validate-schemas.yml)
+[![License](https://img.shields.io/badge/License-Apache_2.0-blue.svg)](LICENSE)
+
 **An open specification for documents that unify viewing and editing, with modern security and machine readability.**
 
 > Status: Draft Specification (v0.1)

examples/academic-document/academic/numbering.json

@@ -0,0 +1,22 @@
+{
+  "version": "0.1",
+  "equations": {
+    "style": "number",
+    "resetOn": "chapter"
+  },
+  "theorems": {
+    "style": "chapter.number",
+    "counters": {
+      "theorem": { "share": ["lemma", "proposition", "corollary"] },
+      "definition": { "share": [] }
+    }
+  },
+  "algorithms": {
+    "style": "number",
+    "resetOn": "none"
+  },
+  "exercises": {
+    "style": "chapter.number",
+    "resetOn": "chapter"
+  }
+}