Route planning by work and brownfield authority

[PatrickSys]

Summary

• Route bounded brownfield changes through explicit brownfield authority instead of forcing unrelated roadmap phase membership.
• Split planning and next-step behavior by authority so active, blocked, ready-for-verification, and closed brownfield states have distinct outcomes.
• Harden generated helper parity, closed-state continuity, material drift blocking, and authority-conflict coverage.

Tests

• rtk node --test --test-reporter=spec tests/gsdd.next.test.cjs tests/phase.test.cjs tests/gsdd.init.test.cjs tests/gsdd.guards.test.cjs tests/gsdd.scenarios.test.cjs
• rtk node bin/gsdd.mjs health --json
• rtk git diff --check
• Generated helper brownfield preflight assertion for expected missing-change blocked result without phase fallback

[gemini-code-assist]

Code Review

This pull request establishes .work as the canonical, local-only continuity surface for gsdd next by adding .work/ to the root .gitignore and removing all previously tracked .work files (including milestone plans, roadmaps, phase packets, and research notes) from the repository. Additionally, it documents this architectural decision under 'D64 - Work-Native Continuity Authority' in distilled/DESIGN.md and distilled/EVIDENCE-INDEX.md, clarifying that .work holds active runtime state and should remain untracked in the framework repo, while legacy .planning files remain readable. There are no review comments, so I have no additional feedback to provide.

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