Improve overlay failure hints

[SilverSupplier]

Summary

• Improve overlay failure reasons for anchor position, scale mismatch, dependency failure, and detached seal proximity.
• Add structured overlay scale hints so the next-action copy stays aligned with operator-specific scale failures.
• Make martial_axis dependency feedback player-facing by referring to the prior cut decoration instead of internal operator names.
• Add EditMode and PlayMode coverage for overlay failure and success feedback paths.

Related Issues

• Closes: [Child #14] overlay anchor/dependency 실패 힌트 개선 #39
• Related: [Child #13] world drawing buffer와 seal 유지시간 튜닝 #35, [Child #14] base family별 실패 힌트 문구 개선 #38, [Child #14] feedback escalation 테스트 보강 #40
• Follow-up:

Merge Order

• Ready to merge directly into main: GitHub reports MERGEABLE / CLEAN after the latest branch refresh.
• No prerequisite PR remains open for this branch. The earlier timing/build/floor-reaction prerequisites have already landed in main.
• Suggested remaining queue: merge this PR first, then Strengthen feedback escalation coverage #61, then Strengthen final floor guidance and ending #63. Local merge-tree simulation confirmed that queue has no content conflicts as of 2026-05-26.

Verification

• Latest GitHub build, test, validate-docs, and codeql checks passed after refreshing the branch.
• Local merge-tree simulation against the remaining open PRs passed without content conflicts.
• Previous Unity EditMode and PlayMode coverage was added for the overlay hint paths.
• npm test; Not run locally, Unity-only change.
• npm run build; Not run locally, Unity-only change.

Notes

• Scope: overlay recognition-result copy, overlay scale/anchor/dependency hints, detached seal proximity feedback, and regression coverage.
• Risk notes: this touches overlay recognition flow and PlayMode coverage, but the branch is now up to date with main and no longer depends on another open PR.

Review Checklist

• This PR changes user-facing UI or behavior.
• This PR changes recognizer behavior.
• This PR changes docs, task state, or project process.
• This PR changes ML artifacts, datasets, generated outputs, or capture/export behavior.
• This PR changes logging, survey fields, privacy, or research data handling.
• This PR needs screenshots or a short playtest note.

Screenshots / Playtest Notes

Batchmode PlayMode coverage confirms detached overlays, oversized overlays, and martial_axis dependency failures show player-facing next-action hints.