Two producer-side defects from the S7 acid test (ordre 20260907T234741Z-9578626297-from-.claude), both reproduced on K2 before and after.
F1: `okf build --ingested-at` alone stamped only 11/629 concepts -- the unsegmented ones, which read the call's value directly. The 618 segmented concepts read `segment.ingested_at`, the plan's `proposed_at`, independently defaulted to `DEFAULT_STAMP`. `proposed_at` now falls back to `ingested_at` when omitted; neither flag passed still yields `DEFAULT_STAMP` for both.
F2: the consumption pre-pass's index walk counted a root-linked `log.md` (`corpus.link_log_in_root_index`, `95eb271`) as a concept, inflating a 629-concept K2 rebuild to 630 and letting the log rank and cut like real content. The link stays -- the contract is silent on `log.md` and `95eb271` already named it a LOCAL choice -- but the walk now treats `LOG_NAME` like the index itself: reachable, never a concept.
K2 rebuilt twice from the same corpus and diffed against the delivered `K2-bundle-20260903`: FOR (stashed fix, matching fbaac6d) reproduces po's numbers exactly -- 619/1108 files differ, 618 ingested_at-only, ref `sha256-tree:4ffd750c...`. ETTER (fix applied) leaves exactly 1 line differing (the deliberate log link, predating this fix) -- 0 files stamped 1970, 629/629 stamped 2026-09-03, ref `sha256-tree:f14872a0...`. The delivered bundle's ref is unchanged before and after (`sha256-tree:9a4e5561...a968b5`), since it carries no log link and the new branch never fires. Conservation identity holds both times: merged + coded rejections = 43 = N, 39/0/4.
1258 -> 1260 tests. mypy --strict clean on 28 files. ruff clean. Both goldens byte-unchanged.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Kjell Tore Guttormsen
5a0c8794af