test(config): harden gate.readiness.minScore round-trip coverage

[bohdansolovie]

Fixes #2053

Summary

Adds focused unit tests for gate.readiness.minScore parse/serialize behavior in focus-manifest.ts:

• gate.present flips true when only readiness.minScore is set
• Boundary round-trip (0, 1, 42, 99, 100) through gateConfigToJson → parseFocusManifest
• Invalid values (string, NaN, ±Infinity) warn and null out the score
• Omitted minScore stays absent from serialized readiness block

Test-only hardening; no production behavior change.

Test plan

• CI validate-code (vitest suite includes focus-manifest.test.ts)

Made with Cursor

[superagent-security]

Superagent didn't find any vulnerabilities or security issues in this PR.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.47%. Comparing base (5bf0a77) to head (e18f325).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3436   +/-   ##
=======================================
  Coverage   93.47%   93.47%           
=======================================
  Files         292      292           
  Lines       30797    30797           
  Branches    11225    11225           
=======================================
+ Hits        28786    28787    +1     
  Misses       1355     1355           
+ Partials      656      655    -1     

see 1 file with indirect coverage changes

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_{🟩 Safe / merged · 🟦 Advisory · 🟨 Held for review · 🟥 Blocked / closed · 🟪 Reviewing}

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Gittensory approves — the gate is satisfied and CI is green.