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CB-WP-0021 T01/T02/T05: the engine plays its own data — AM-7 blocks

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ADR-0011 decided it: vendor the CSV with a checked digest, read it with
a ~50-line reader, and let the hashes move.

The declaration's constraint was measured against the WRONG BUDGET. It
said a CSV crate costs 21,613 against AM-4a's 3,798 of headroom, '5.7x
over, settled by measurement'. But setup and problem_priorities are
cfg(scenarios) and are not in the shipped runtime at all, so AM-4a never
sees them. Against AM-4b, csv costs 17,651 against 19,742 -- it FITS,
with 2,091 to spare. It is refused anyway, on proportion: 89% of the
budget's remaining capacity to read 20 rows. The revisit condition is
stated (nested quoting, embedded newlines, multiple dialects).

GR-S01 now deals Surface + hidden 1..=k as ruled, with edition values and
suits. Measured: 6/9/12 available against thresholds 5/7/9 -- the game is
winnable at every seat count, which is what the maintainer could not do.
gd0001 is INVERTED, not deleted, and now also asserts the 6/9/12 so a
deal that is reachable for the wrong reason still fails.

Blast radius was scenario expectations, exactly as the ADR predicted: no
scenario pinned a hash and no bundle is committed. Six scenarios and two
unit tests updated, each with a note. gr-e01-threshold-unreachable-2p is
RENAMED to -reachable- and rewritten as the non-provisional import check
ground-game asked for by name. gr-e03's setup was restructured, not just
renumbered: with values 2,2,2 its personal-edge test would have tied
three ways and asserted nothing.

BLOCKING: AM-7 fails at median 0.845 against its 0.9 floor. Isolated
across three runs -- 3 problems + stand-in 0.97, 3 problems + edition
0.909, 4 problems + edition 0.845. State is BOUNDED (proven: identical
after 5k and 100k events), so this is not the unbounded-growth defect
AM-7 exists to catch; it is a bigger working set streaming a long log.
Whether AM-7's floor is still right for a larger aggregate is a spec
question and lowering it requires an ADR, so it is not being tuned here.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
tegwick 2026-08-04 00:47:56 +02:00
parent f2281fa86c
commit 2da19a49b7
16 changed files with 593 additions and 167 deletions
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46
games/ground/src/bot.rs
View file

@ -1077,42 +1077,12 @@ mod tests {
}
}
/// **A recorded finding, not a desired property.** With the standard
/// preset's placeholder Problem values (value = priority), the total
/// a game can possibly reach is below GR-E01's threshold at 2, 3 and
/// 4 players — group success is unreachable regardless of play. Only
/// 5–6p can clear its 9.
///
/// This test pins the arithmetic so the gap cannot close silently.
/// **It is expected to fail** when Problem values become scenario
/// data (GR-S01 calls the current fixture a stand-in); the failure is
/// the signal to delete it, not to re-tune it.
#[test]
fn the_standard_preset_cannot_reach_the_threshold_below_five_seats() {
let mut report = Vec::new();
for players in 2..=6u8 {
let initial = setup(players, 42);
let best: u32 = initial.problems.values().map(|p| u32::from(p.value)).sum();
let threshold = play(initial, &mut policies("greedy", players, 42))
.expect("game")
.state
.outcome
.expect("outcome")
.threshold;
report.push(format!("{players}p best {best} vs threshold {threshold}"));
if players < 5 {
assert!(
best < threshold,
"{players}p: best {best} now reaches threshold {threshold} — \
the fixture changed, delete this test"
);
} else {
assert!(
best >= threshold,
"{players}p: best {best} cannot reach threshold {threshold}"
);
}
}
println!("GR-E01 reachability: {}", report.join(", "));
}
// `the_standard_preset_cannot_reach_the_threshold_below_five_seats`
// lived here and was deleted 2026-08-04, on its own instruction: it
// said "the failure is the signal to delete it, not to re-tune it".
// ground-game ruled GR-S01's deal and the game became winnable.
//
// The record did not go with it. `gd0001_group_success_is_reachable_at
// _every_seat_count` in lib.rs is the same arithmetic, inverted rather
// than removed, and carries why the numbers changed.
}