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AM-4: gate scenario YAML, retarget on audited source, re-measure
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Adopts both remediations from CB-EV-0001 §4 (maintainer decision).

Option A — serde_yaml is now optional behind cb-game-runtime's
`scenarios` feature. The scenario module, the ScenarioGame impl and the
string parsers behind it are cfg-gated; cb-sim opts in explicitly. Both
configurations compile and lint clean under -D warnings.

A trap worth recording: `default-features = false` on a *member*
dependency is silently ignored when the workspace dependency does not
specify it. The first attempt gated nothing while looking correct — the
build succeeded and cargo tree still showed all six YAML crates. Fixed
by setting it on the workspace dependency. This is the positive-control
failure mode in miniature: success was not evidence the change applied.

Retarget — AM-4 now measures third-party source under audit, split by
build configuration, replacing a crate count that was unreachable
without undoing K5/K7 and that does not compare across ecosystems.

Re-measured via the new `make dep-weight`, whose own positive control
refuses to report when any crate's source cannot be located:

  shipped runtime   23 crates   246,250 lines   target <=250,000  met
  dev toolchain     29 crates   317,021 lines   target <=350,000  met
  own source                      3,408 lines

Scenario tooling costs 70,771 lines a shipped game never compiles —
the split the single number was hiding.

Targets are set at current measurement plus headroom, so they bind on
future growth rather than retroactively passing what had failed.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
tegwick 2026-07-31 03:35:41 +02:00
parent 8e11fc412e
commit 4be6e020ea
12 changed files with 271 additions and 43 deletions
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8
WORK-RECORDS.md
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@ -9,6 +9,7 @@
| Kind | ID | Status | Lane | Source |
| --- | --- | --- | --- | --- |
| workplan | CB-WP-0001 | done | — | workplans/CB-WP-0001-inner-loop.md |
| workplan | CB-WP-0002 | proposed | — | workplans/CB-WP-0002-cost-accounting.md |
| task | CB-WP-0001-T01 | done | — | workplans/CB-WP-0001-inner-loop.md |
| task | CB-WP-0001-T02 | done | — | workplans/CB-WP-0001-inner-loop.md |
| task | CB-WP-0001-T03 | done | — | workplans/CB-WP-0001-inner-loop.md |
@ -18,3 +19,10 @@
| task | CB-WP-0001-T07 | done | — | workplans/CB-WP-0001-inner-loop.md |
| task | CB-WP-0001-T08 | done | — | workplans/CB-WP-0001-inner-loop.md |
| task | CB-WP-0001-T09 | done | — | workplans/CB-WP-0001-inner-loop.md |
| task | CB-WP-0002-T01 | todo | — | workplans/CB-WP-0002-cost-accounting.md |
| task | CB-WP-0002-T02 | todo | — | workplans/CB-WP-0002-cost-accounting.md |
| task | CB-WP-0002-T03 | todo | — | workplans/CB-WP-0002-cost-accounting.md |
| task | CB-WP-0002-T04 | todo | — | workplans/CB-WP-0002-cost-accounting.md |
| task | CB-WP-0002-T05 | todo | — | workplans/CB-WP-0002-cost-accounting.md |
| task | CB-WP-0002-T06 | todo | — | workplans/CB-WP-0002-cost-accounting.md |
| task | CB-WP-0002-T07 | todo | — | workplans/CB-WP-0002-cost-accounting.md |