docs: executive summary, roadmap, and traceability spec

[flyingrobots]

Summary

• EXECUTIVE_SUMMARY.md — single-page explainer: what XYPH is, why it matters, current state, architecture
• ROADMAP.md — narrative roadmap with milestone dependencies and ordering (DONE → NEXT → FUTURE)
• TRACEABILITY.md — draft canonical spec for the requirements-to-evidence graph model (stories, requirements, criteria, evidence nodes, computed completion, test annotations)

Context

These docs emerged from a session reviewing the project's direction. The traceability spec reconciles with existing canonical docs (GRAPH_SCHEMA.md, DATA_CONTRACTS.md, ROADMAP_PROTOCOL.md, VISION_NORTH_STAR.md) and identifies where each needs to evolve.

Test plan

• No code changes — docs only
• Build and lint unaffected

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📥 Commits

Reviewing files that changed from the base of the PR and between 4f8a01a and 2fcadf3.

📒 Files selected for processing (3)

• docs/EXECUTIVE_SUMMARY.md
• docs/ROADMAP.md
• docs/canonical/TRACEABILITY.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch docs/executive-summary-roadmap-traceability

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