chore: ignore internal planning docs

[MapleEve]

Summary

• Ignore local-only internal planning files: CONTEXT.md, CONTEXT-MAP.md, and docs/adr/.
• Keep roadmap/context/ADR materials out of the tracked public repository surface.

Validation

• Public release scan passed.
• No runtime code changes.

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[claude]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.39%. Comparing base (98f151f) to head (3d2ee95).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #34   +/-   ##
=======================================
  Coverage   91.39%   91.39%           
=======================================
  Files          79       79           
  Lines        3149     3149           
=======================================
  Hits         2878     2878           
  Misses        271      271           

Flag	Coverage Δ
unit	91.39% <ø> (ø)

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