[noahgift]

Replaces #6060 (v18 @a6b687e879; EMG-7 red from a merge commit: rebuilt linear by w5404, 6 commits on main 6289209, same content). v19 @cfd38a13d5. Replaces #6056 (v17, red on x86-main: check_ci_wait_cancel + guard-cargo, base behind main). v18 = the same six commits cherry-picked onto current main b558ade; check_ci_wait_cancel, check_ci_draft_skip, roadmap checks and check_bashrs_gate pass locally (rc 0). Earlier history follows.

EMG-001 epic n-receipt v19 (non-gate)

Replaces #6055 (v16; seat 2 found crates/aprender-contracts-key had no README.md, FALSIFY-README-CRATE-001). v17 = v16 plus that README in the PMAT-5909 commit. Before that: replaces #6047 (v15). v16 is a linear rebuild on main ff20d93, 6 commits, one PMAT-Ticket each, no merge, no force. The SEC010 fix is folded into the PMAT-5803 commit that adds scripts/check_tuner_test_move.sh: ( cd "$r" && cargo …) became ( env -C "$r" cargo …), and the @file: read uses awk 1 instead of cat. scripts/check_bashrs_gate.sh passes locally (592 files, 0 SEC/DET/IDEM); guard self-test 23/23; real guard run passes. CI not run by the author. Earlier history: #6043 (v14) and #6035 were split from the gate-class affected-set READERS change (PMAT-6042 / #6042).

• 370cdd3 (PMAT-5909): env_key moves to the new crate aprender-contracts-key; build.rs stops build-depending on the engine.
• 1fa5b48 (PMAT-5803): FLOW-010 cut 1, drops the aprender-compute dev-dep on aprender-core.
• bd7eabf (PMAT-5502): parity_receipt_denominator.sh verify runs in guards-nightly as a LAB step.
• ab1a493 (PMAT-5557): simulate course_flow Content Factory v2 (FLOW-007 B5a).
• 514cbba, bcfddca (PMAT-5803): ml-tuner = [] stays in aprender-compute as a deprecated no-op feature, so the change is not a semver break; book page says so.
• Fragments 295 and 298 stay. .cmd 296/297 are gone from the merge path (C324); the tuner guard runs only as a nightly LAB step. Not compiled locally by the author; CI is the first build.

New published crate: aprender-contracts-key. Its first publish claims the crates.io name, so it must be in tier 1 of the publish order.

Version: the tree is 0.71.3 (Cargo.toml on main); crates.io already has 0.71.4, so the release must bump past that.

Files in the diff: see the Files tab (list carried from #6047).

Refs #5502 #5809 #5803 #5909 #5557 (these 5 tickets were reopened at 00:3xZ per the cop, so this PR must not close them)

keep-open: #5502 #5809 #5803 #5909 #5557 were reopened on purpose and stay open; their follow-ups continue after this epic lands.

ont-delta: none no new type, shape or reason; epic fold of existing tickets

🤖 Generated with Claude Code

keep-open: #6060 is closed by wsweep as superseded.

[github-actions]

§13.11 rung 1 — quorum shadow verdict

S13-SHADOW pr=6089 head=cfd38a13d5c6e88b554a6054a0ee969ebc4003de verdict=REFUSE class=Q1 arm_rc=1

Shadow mode: this records a verdict and merges nothing. A refusal
to arm is not a block (§13 adds zero rows to §7) — the pull request is
exactly as green as it was.

[noahgift]

Snapshot: head cfd38a1. Superseded by #6097 (cop order, aprender-57; non-draft cap). Branch kept; closing.