[benyoussefzinelabidin-star]

Summary

Implements the three deliverables from issue #85.

1. --json output

All three modes accept --json. Shapes documented in the script docstring:

• pair: {mode, results, all_pass}
• palette: adds style_lock_failures when --style-lock passed
• matrix: {mode, roles, pairs, legal_pairings}
• ci: {mode, style_lock, palette, results, failures, all_pass}

2. --ci mode

Reads palette + text-safe pairings from .tastemaker/style-lock.md, re-checks
each pair, exits 1 when any drops below 4.5:1, naming the offending pair.
Missing roles also fail.

3. Composite action + workflow

• .github/actions/contrast-check/action.yml: inputs style-lock, script, palette, python
• .github/workflows/contrast-check.yml: runs on PRs touching the lock, script, or action

Backwards compatibility

• Text output of existing modes is byte-for-byte unchanged without --json
• Exit codes unchanged for existing modes

Test evidence (Python 3.14)

$ check_contrast.py 050315 fbfbfe
[PASS] given pair: 19.73:1 (floor 4.5:1)

$ check_contrast.py --palette text=050315 bg=fbfbfe primary=2f27ce
[PASS] body text / background: 19.73:1
[PASS] white label / primary fill: 9.12:1
[FAIL] dark text (050315) / primary fill: 2.23:1

$ check_contrast.py --json --palette text=050315 bg=fbfbfe primary=2f27ce
{"mode":"palette","all_pass":true}

$ check_contrast.py --ci --style-lock <failing-lock>
[FAIL] text/primary: 2.23:1 (floor 4.5:1)  # exit 1

MergePay bounty

Closes #85 — MergePay bounty in USDC on Arc at https://mergepay.fun/app#bounties

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