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CB-WP-0019 T01/T02: AM-4b asks what a contributor acquires
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The two AM-4 budgets had the SAME scope -- one package, no dev edges --
while claiming to bound different things. AM-4b now measures the
workspace with dev edges: 57 crates / 725,258 lines where it read 29 /
317,021, having been blind to 28 crates and 408,237 lines, more source
than its own target.

Target 745,000, ~2.7% of room -- the same margin ADR-0008 D3 gave AM-4a,
applied to a number that grew because the instrument was repaired, not
because anything was added. The target moved to fit the measurement.

T02: proc-macros are COUNTED here and excluded from AM-4a, on purpose.
AM-4a asks what ships and a proc-macro never ships. AM-4b asks what is
acquired, and ADR-0007 D3's acquisition rule counts what the build
fetches -- 'it does not ship' is no answer to 'we downloaded it'. When
the rules disagree, the question each budget asks decides. Measured
share 109,585 lines / 15.1% against AM-4a's 36.2%, so ADR-0008 D2's
refusal to borrow the ratio was right by more than a factor of two.

Caught by this project's own earlier work twice: the mutation
find-string went stale and --self-test reported it BUILD-FREE (the check
CB-WP-0015 added after AM-4a's rotted for two passes), then the DFD gate
caught facts.toml carrying the old numbers.

CB-EV-0001 and ADR-0004 carried live fact: tags on historical readings.
A dated record asserting a CURRENT value is a category error, so those
occurrences are marked as-measured instead of retro-edited, and ADR-0004
gains a supersession note.

make all exits 0.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
tegwick 2026-08-03 19:04:54 +02:00
parent 8793749654
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10
decisions/ADR-0004-am4-ratification.md
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@ -1,3 +1,11 @@
> **Superseded in part, 2026-08-03 (CB-WP-0019 T01/T02).** This ADR
> ratified AM-4b at ≤350,000 against a graph measuring 317,021 — but that
> graph was **one package with no dev edges**, blind to 28 crates and
> 408,237 lines. AM-4b now asks *what a contributor acquires*
> (`--workspace --edges normal,dev`, proc-macros counted) and its target is
> **745,000**. The reasoning here still stands; the scope it was applied to
> did not. See `specs/GameKernel.md` §5c.
# ADR-0004: ratify AM-4a and AM-4b
> **Superseded measurement (ADR-0008 D2/D3, 2026-08-02).** The AM-4a
@ -58,7 +66,7 @@ At the time of the retarget, `make dep-weight`:
| configuration | crates | third-party LOC |
|---|---|---|
| shipped-runtime (`--no-default-features`) | 23 | **246,250** | <!-- historical: measured under the pre-ADR-0008 instrument; not a live fact -->
| dev-toolchain (default features) | 29 | **317,021** | <!-- fact:am4b_loc -->
| dev-toolchain (default features) | 29 | **317,021** | <!-- as-measured 2026-07-31; AM-4b was rescoped by CB-WP-0019, see GameKernel 5c -->
| own source | — | 3,443 |
## Why these targets bind on future work rather than merely passing present work