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ADR-0004: ratify AM-4a and AM-4b (maintainer decision)

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Discharges the open item T07 raised. Values unchanged at 250,000 and
350,000; what was missing was a reviewed decision behind them, since
they had been set by the implementer in the commit that measured them
and that also changed the feature gating being measured.

The ADR supplies the argument T07's test requires -- why the targets
bind on FUTURE work rather than merely passing present work:

  AM-4a leaves 3,750 lines of headroom (1.5%), about one small crate,
  so any new shipped-runtime dependency breaches it almost immediately.
  That is intended: the shipped runtime should be effectively frozen.

  AM-4b leaves 32,979 lines (10.4%), deliberately looser -- dev tooling
  should absorb one moderate dependency without a spec change, not two.

  Both are ceilings on a quantity that only grows by choice. Nothing
  drifts across them; only adding a dependency does.

Falsification condition stated: if a later pass raises AM-4a to
accommodate a dependency it wants, that is the failure the ceiling
exists to catch, and the answer is an ADR arguing for the dependency.

First ADR written under the correction/retarget test; sets the shape.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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tegwick 2026-07-31 09:45:35 +02:00
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12
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@ -136,12 +136,12 @@ evidence files.
## Open items raised by this audit
- **AM-4a / AM-4b are unratified retargets.** Measured at 246,250 and set
at 250,000 in the same commit, by the implementer, with the
implementation changing in that commit too — a retarget under the test
added to InnerLoop §Step 4 by T07, not a correction. They must be
ratified by ADR or changed. Until then `make dep-weight` is enforcing a
target no reviewed decision stands behind.
- ~~**AM-4a / AM-4b are unratified retargets.**~~ **Discharged
2026-07-31** by [ADR-0004](../decisions/ADR-0004-am4-ratification.md),
ratified by the maintainer. Values unchanged; the ADR supplies the
future-binding argument the test requires (AM-4a leaves 1.5% headroom,
AM-4b 10.4%, and both measure a quantity that only grows by deliberate
choice).
## Class coverage — where the gaps are