Merlin
c559d33131
The last runtime-resolution route in Q45 s7-limit-1's family with neither a literal nor an ast-visible env read: HELM_HOME = Path.home() / ".helm" composes the live root because CPython's posixpath.expanduser reads HOME itself. The channel is live in the shipped subject -- the real collector calls Path.home() twice (its himalaya search). Mechanism: an ast inventory of home-database reads (_q52_home_sites, :786) and, inside Q50's one rebuild function (two callers, probe :977 / legs :1162), a redirect of HOME + USERPROFILE to <target>/q52-home -- a redirect, not a refusal -- with a conditional Q52 NOTE and one new check("Q52", :1204). A --q52-witness extra flag (:1261) runs the copy with --deploy --pin --skip-tests --out <sandbox dest>, the pin shape the suite itself refuses (Q44's rule), because the class's write path is unreachable from the green run.
Measured: green 5/5 at 176 passed / 0 failed (= 175 + 1), 14,044 B stdout, live delta {}; the real collector's own .home() read makes the check non-vacuous. Discriminator, five cells under the digest-verified guard: armed x collector-home.py (d62888c4) -- the copy resolves inside the sandbox and the pin lands at q52-home/.helm/data/held/stackchain-home.html.sha256 in the sandbox, live delta 0; armed x collector-expanduser.py (99c49d39) -- same; disarmed x home -- HOME stays /root, the copy resolves HELM_HOME=/root/.helm and the live pin moves to sha256 caff1f504855264a / mtime_ns 1791907100434371499, restored byte-exact; disarmed without the witness flag -- the foot's own check fails (FAIL Q52, home_reads=['.home()'] HOME='/root', 174 passed / 2 failed); direct invocation, ambient env -- the live pin moves (the class's floor). Regressions 11/11 hold; live delta 0 on bytes/sha256/mtime across all 21 invocations (snapshot 14,039 B / aa842b0f, held pin 120 B / 5b6d7071); ctime moved on both objects (1791907371554631194), the guard restores of the two deliberately-live rows -- disclosed. Final tree 0 sandboxes; deployed /root/.helm/bin untouched (7ed1bca8, grep -c HELM_COLLECTOR = 0 -- Q40 stands, so none of Q31-Q52 is in production); disk 46 GiB free of 154.
Five defects of mine logged first in the deliverable: the witness's missing local subprocess import; the witness anchored before the leg copy was written; the witness's live census reading the held directory (IsADirectoryError); the NOTE claiming a redirect that had not fired (the disarmed twin's own FAIL contradicted it -- the NOTE is now derived from the actual env); and the first matrix measuring nothing because the real collector pins only under --pin, which the suite refuses. Limits stated as the item's own: the original-subject legs inherit the ambient environment (Q48's residual); pwd.getpwuid().pw_dir bypasses HOME (the inventory names it, the redirect cannot relocate it); the inventory is static (Q46's limit).
Files: recoveries/helm-home-channel-guard.md (13,173 B / sha256 3f813ca23202590c675f7ac7587f0d5e7d8b0ff9ee9f4f0711996530a2d6d7db), WORK-QUEUE.md (897,771 B), checkins/2026-10-13-merlin.md (Run 18). Scratch tree /root/crucible/q52/ not committed. No deployment, decisions/ and inbox/ untouched, no another-party file edited, no secret printed. The Helm lane's executable set is empty again; the adoption cp (collector 4e45021d + gate 78b290ec, superseding e4967da9) remains Alexander's.
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