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spec(port): port the cover-traffic entropy fingerprint guard (Refs #8887) - #9813

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dmitrii-f-t27 wants to merge 1 commit into
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dmitrii-f-t27:port/cr-chat-07-h
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dmitrii-f-t27 wants to merge 1 commit into
gHashTag:masterfrom
dmitrii-f-t27:port/cr-chat-07-h

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@dmitrii-f-t27

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Refs #8887 (CR-CHAT-07 ring tracker). Parent epic: gHashTag/trios#1812 (W2, own lane, T-PORT). Eighth CR-CHAT-07 ring target delivered: the cover-entropy rules (R-CHAT-10) — empty probe, length floor (64), alignment grid (64), expected length class, zero-run ceiling (8; exact-eight boundary passes in CTEF-08), entropy floor (3.0 bits) — D5 verdict with the code alone (no payloads), the original's rule order, all ten CTEF tests transcribed plus helper and rule-order tests (12 total, 0 vacuous). shannon_entropy (int→float + log2 fold) does not lower under the backends — the entropy arrives caller-computed per the lane convention (#9698/#9747/#9752/#9811); max_zero_run ports whole; all fixture statistics Python-verified exact (good 6.0 bits/64 distinct bytes, 0x42-cover 0.0, nine-zero 0.586/run 9, eight-zero boundary 5.625/run 8). t27b 12/12 native; t27c 12/12; gen-rust compiles under rustc (0 errors, 0 &'static str, 0 Vec<const); coverage Untested 0; seal all hashes MATCH; ledger row included (pass, non-pass untouched). Dedup checked. Sequencing: one-line ledger rebase if the earlier lane PRs land first — I take it on request.

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Merge request for the gHashTag merger: steward READY (required all SUCCESS — validate, check-linked-issue, parse-ratchet, t27b-native-linux, t27b-native-macos; the red ones are non-required per Q16 and red on master too). Ledger row included; one-line rebase if the earlier lane PRs land first — I take it on request.

…ashTag#8887)

Rebuilt as one commit on master a1002be so it merges;
docs/reports/t27b_expectations.json rows from both sides kept (union, sorted).
Content is otherwise the PR head d810aee unchanged.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
@gHashTag
gHashTag disabled auto-merge October 17, 2026 18:41
gHashTag pushed a commit that referenced this pull request Oct 17, 2026
)

Landed from #9813 as part of one combined PR (the Actions queue could not
carry 28 single runs while master kept moving under the ledger rows).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Carried unchanged, with its original author, as one commit of #10097 (tracking #10096). That PR lands all 25 green CR-CHAT-04/07 ports at once, because each single PR kept conflicting on the ledger rows before its CI could finish. Closing this one so its queued jobs free the Actions queue.

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