docs: wire design-to-plan layer

[aryeko]

Summary

• links the seeded design-to-plan Planning-layer repo from the roadmap and profile
• marks M4 done and promotes M5 to current
• updates Planning/Jig wording to reference Jig's v0 execution-plan contract shape rather than a frozen schema
• records design-to-plan PR chore: add standard repo check surface #1 as M4 evidence

Verification

• pnpm check
• git diff --check

[chatgpt-codex-connector]

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[aryeko]

Review result: request changes before merge.

Blocking fix:

• MILESTONES.md: M4 is marked State: done, but the evidence says design-to-plan PR chore: add standard repo check surface #1 was "opened" and .github PR docs: wire design-to-plan layer #12 "wires" the updates. This will be the durable post-merge milestone record, so phrase it like the prior milestones: design-to-plan PR chore: add standard repo check surface #1 merged with checks green, and .github PR docs: wire design-to-plan layer #12 merged with roadmap/milestone/profile updates and checks green.

Merge-order note for the existing roadmap-link review thread: keep the blob/main links only if this PR is merged after design-to-plan PR #1. The parent reviewer will enforce that order or resolve the thread after PR #1 lands.

After fixing, rerun pnpm check and git diff --check, push the branch, and leave the PR open for re-review.

[aryeko]

Review passed after fixes. Formal approval is blocked because GitHub does not allow approving my own PR. Evidence: unresolved threads are 0, pnpm check passes locally, git diff --check passes locally, and the GitHub check workflow is green on head d56e385. This PR should merge after design-to-plan PR #1 so the roadmap blob/main links resolve.