ci(coverage): set the coverage baseline at measured current (78%)

[stranske]

Why this file matters

Without config/coverage-baseline.json, tools/coverage_trend.py reports baseline_status: absent and computes no delta — and Maint Coverage Guard has nothing to compare against. A coverage regression in this repo is currently undetectable.

The number

Measured 78.01% from this repo's own coverage payload, floored to 78, with warn_drop: 1.0 absorbing run-to-run jitter.

Set at measured current, not at an aspiration — deliberately. Both failure directions are live in this fleet right now:

repo	baseline	real	effect
Fine-Art-Archive	25	81.45%	56 points low — cannot fail
Workflows	85	76.72%	8 points high — red on arrival

A baseline above reality gets switched off; one far below it never fires. Same defect, opposite directions.

Keyed line

Both coverage_trend.py and coverage_guard.py accept line or coverage, with line taking precedence. That mismatch was itself a live defect until stranske/Workflows#3251, under which this repo's trend silently scored 0.0.

It's a ratchet

Raise it as coverage rises. It is not a target, and it should never be lowered to make a run pass.

🤖 Generated with Claude Code

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• config/coverage-baseline.json

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