The nightly headroom monitor flagged fileSize 🟡 permanently because the worst
frozen file was src/app/docs/lib/openapi.generated.ts — frozen at its emitter's
exact output size in #12212, i.e. ~0% headroom BY CONSTRUCTION (growth is
policed by conscious re-freezes, never by editing the module). Same class:
open-sse/vendor/** (upstream code nobody slims by hand).
isMonitorExemptFile() excludes .generated. modules and vendor/ paths from the
monitor's worst/near-cap accounting only — check:file-size itself still
enforces both. The fileSize row now points at the worst HUMAN-EDITABLE frozen
file (currently tests/integration/skills-pipeline.test.ts at 4.5%, a true
early warning: its baseline note already requires a split rationale for any
further growth).
Refs #12149
Owner decision (2026-08-30): shipping speed matters more than holding the debt line
until the v4.0 LTS modularization; the base was going red on every merge batch and
each red baseline cost a sweep.
Relaxation (one auditable pass, scripts/quality/relax-baselines.mjs):
- quality-baseline.json metrics: lower-is-better ×1.2, higher-is-better ÷1.2
(coverage floor 60 kept; eslintErrors stays 0; eslintWarnings 0 → 1050 = 20% of
the 5,247 frozen suppressions). Adds `_policy {phase: velocity, until: 4.0.0,
relaxPct: 20, requireTighten: false}` + a `_relax_velocity_2026_08_30` note
listing every before → after.
- complexity count 2681 → 3218; duplication 5.72 → 6.86; file-size cap/testCap
1000 → 1200 and all 127 frozen caps ×1.2; api/dashboard/open-sse typecheck
per-file counts ×1.2; openapi-coverage THRESHOLD 36 → 30.
- check-quality-ratchet: --require-tighten is advisory while _policy.requireTighten
is false (2 new tests); nightly bank-ratchet-shrinks pauses during the phase (it
would bank the measured shrink and undo the headroom every night).
Monitoring (scripts/quality/baseline-headroom.mjs, npm run quality:headroom):
measures each numeric gate the way CI does, prints live / baseline / headroom per
gate (ok ≥10%, warn <10%, critical <0); the new nightly `baseline-headroom` job
posts the table to the living issue "📈 Baseline headroom (velocity phase)" and
toggles the `headroom-alert` label. 6 unit tests on the pure helpers.
Also aligns the remaining red tests on the tip to contracts already merged:
#11775 (FREE lease-capable connections are ordinary capacity: gate inventory 48/97/99,
sse-auth selection, warmup scheduler), #11794 (dual-loopback readiness probe), and the
8 vi strings #11775 left as __MISSING__.
Docs: QUALITY_GATES.md → "Velocity phase" (what changed, tooling, how to close the
phase at 4.0), AGENTS.md quick reference.
