docs: add Phase 2 comprehensive agent-plane schema documentation

[Copilot]

Adds PHASE_2_SCHEMA_DOCUMENTATION.md as the authoritative reference for the 13-schema agent-plane contract layer introduced in this PR.

Coverage

• Schema family overview — all 13 types (ExecutionDecision → EventEnvelope) with $id and purpose
• URN namespace strategy — full urn:srcos: hierarchy, per-namespace regex patterns, ID construction convention
• Dependency graph — ASCII DAG of all $ref and cross-document *Ref relationships with binding table
• Validation quickstart — Python (jsonschema + RefResolver) and Node.js (ajv 2020-12) examples with real payloads
• OpenAPI/AsyncAPI binding — endpoint and channel tables; yq merge commands for applying the patch fragments
• Complete JSON examples — valid, realistic instances for all 13 schema types
• Versioning discipline — SemVer bump rules, additionalProperties: false rationale, deprecation path
• Imagelab integration — ValidationResult contract, validator binding table, admission webhook flow
• Agentplane artifact integration — SessionArtifact → PromotionArtifact / ReversalArtifact lifecycle with field-level mapping
• Roadmap — Phase 2.5–4 checklist (schema hardening → runtime enforcement → governance extensions → toolchain)
• File inventory — all 15 PR files with line counts and purposes

Original prompt

Phase 2: Comprehensive Schema Documentation

Add comprehensive Phase 2 documentation to sourceos-spec#1 (feat/agent-plane-core-schemas-v0 branch).

Documentation to Add

Create PHASE_2_SCHEMA_DOCUMENTATION.md with:

1. Agent-Plane Schema Family Overview - All 13 schema types with purpose/description
2. URN Namespace Strategy - Hierarchy and validation patterns
3. Schema Relationships & Dependency Graph - How schemas reference each other
4. JSON Schema Validation Quickstart - Python jsonschema and Node.js ajv examples
5. OpenAPI/AsyncAPI Integration Binding - Service contract wiring guide
6. Complete Examples for Each Schema - Practical JSON examples for all 13 types
7. Versioning & Compatibility Discipline - SemVer strategy and backward compatibility
8. Integration with Imagelab Validators - How validators will bind to schemas
9. Integration with Agentplane Artifacts - How artifacts reference these schemas
10. Follow-Up Roadmap - Phase 2.5+ planning
11. Complete File Inventory - All 15 files with line counts and purposes

Files in PR

• ExecutionDecision.json (87 lines)
• AgentSession.json (157 lines)
• ExecutionSurface.json (77 lines)
• SkillManifest.json (125 lines)
• MemoryEntry.json (115 lines)
• SessionReceipt.json (66 lines)
• SessionReview.json (26 lines)
• ExperimentFlag.json (18 lines)
• RolloutPolicy.json (28 lines)
• FrustrationSignal.json (17 lines)
• TelemetryEvent.json (17 lines)
• ReleaseReceipt.json (19 lines)
• openapi.agent-plane.patch.yaml (56 lines)
• asyncapi.agent-plane.patch.yaml (27 lines)
• schemas/README.md (81 lines)

The following is the prior conversation context from the user's chat exploration (may be truncated):

Assistant: Perfect! Now let me verify the other 3 repos and provide a comprehensive status report:

Assistant: Perfect! Now let me check the current state of all PRs and provide a comprehensive status report:

Assistant: Perfect! Now let me compile the comprehensive status report and debrief:

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📊 CRYSTALLIZATION PROJECT - FINAL STATUS REPORT & DEBRIEF

EXECUTIVE SUMMARY

STATUS: ✅ 95% COMPLETE - All core documentation crystallized and pushed

The crystallization audit, design, and execution of the Agent-Plane contract layer has successfully completed across all 4 repositories. Most files are now committed to their PR branches and ready for final review.

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DETAILED STATUS BY REPOSITORY

1. #1 ✅ PUSH CONFIRMED

Branch: feat/agent-plane-core-schemas-v0

Status: 📝 README.md created and committed

Files Pushed:

• ✅ schemas/README.md - Agent-Plane schema documentation with:
  • URN pattern specification (urn:sourceos:execution:decision:, urn:sourceos:agent:session:, etc.)
  • Spec metadata explanation (version, status, last updated)
  • Full JSON usage examples for ExecutionDecision, AgentSession, SessionReceipt
  • Validation instructions (Python jsonschema, Node.js ajv)
  • Versioning discipline (SemVer compliance)

PR Details:

• Created: 1 day ago
• Status: DRAFT (ready for review)
• Commits: 1 (initial push + 1 documentation push)
• Author: mdheller

What's in the PR:

• Core schema scaffolds: ExecutionDecision, AgentSession, ExecutionSurface, SkillManifest, MemoryEntry, SessionReceipt
• Documentation for all URN patterns and validation

Next Steps:

• Request review from schema architects
• Approve and merge to main

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2. SociOS-Linux/imagelab#1 ⏳ PUSH ATTEMPTED - Files not found

Branch: feat/agent-plane-capd-patch-v0

Status: ⚠️ File creation failed - validators/README.md not in repo yet

Attempted Push:

• ❌ validators/README.md - Validator documentation with:
  • ExecutionDecisionValidator, SkillManifestValidator, SessionReceiptValidator
  • Python code examples for all 3 validators
  • Entry points (module-level validate() function)
  • Return format specification (valid, errors, warnings, schema)
  • Admission webhook integration details
  • Current limitations and follow-up schema binding
  • Testing instructions

PR Details:

• Created: 1 day ago
• Status: DRAFT
• Commits: Existing (capd patch file only)
• Author: mdheller

What's in the PR:

• capd/imagelab.capd.patch.yaml - Capability descriptor patch with validator entrypoints

Why File Creation Failed:

• The validators/ directory may not exist yet in the repo
• Need to create directory structure first

What You Need to Do:

cd imagelab
git checkout feat/agent-plane-capd-patch-v0
mkdir -p validators
# Then create validators/README.md with the documentation

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3. SocioProphet/agentplane#7 ⏳ PUSH ATTEMPTED - File not found

Branch: feat/agent-plane-artifact-scaffolds-v0

Status: ⚠️ File creation failed - schemas/README.md not in repo yet

Attempted Push:

• ❌ schemas/README.md - Artifact lifecycle documentation with:
  • ASCII lifecycle diag...

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