Door B listed `inbox.iterdir()` and kept only top-level files. A file in a
subdirectory was neither ingested nor refused: it appeared in none of the
result's buckets, so a nested drop produced a bundle that was silently short
of what was dropped and no count said so. That broke the K1b identity for any
inbox with folders in it. Operator decision 2026-09-06.
- `walk_inbox` is the ONE walk rule, shared with `tools/okf_corpus_run.py`:
the denominator N is now counted over exactly the set of files the door
ingests, rather than over a second listing that happened to agree.
- Sorted on the whole relative path, not the basename, so the order is a
function of the tree; that is what keeps rebuild-from-scratch byte-equal to
an incremental update.
- A concept's `source_file` is the path relative to the inbox root,
`/`-separated. The concept NAME still comes from the basename, so two
folders holding one basename hit the existing §3 collision refusal instead
of one silently claiming the other's concept.
- Dot-directories and a bundle directory inside the inbox are skipped with a
CODE, in a new `InboxResult.skipped`. Recursion makes the door's own output
reachable as its own input; a silent skip would be the same
absence-without-a-denominator defect one level down.
- `--path-prefix` reduces per component and rejoins with `/`, so the caller
driving a nested corpus can carry the relative directory. Reducing the whole
string folded the separator into a `-` and flattened `sub/sub2`.
`tests/test_inbox_flow.py::test_subdirectories_are_not_walked` asserted the
opposite and is superseded in place, with the reason written down.
Measured on the K2 corpus (flat, N=43): 39/43 merged, 4 coded, K1b holds. The
bundle digest is
`1472e98aec8643c5beee540f4c42b5e437bd26e7c61d69a91bcff799f06a6d13` over 1108
files -- byte-identical to a run of the same corpus at 190086f WITHOUT this
change (`diff -r` exit 0), so recursion costs a flat inbox nothing. It differs
from the stored 2026-09-03 artifact by one line in `index.md`
(`- [Corpus run history](log.md)`), which 95eb271 added 15 hours after that
bundle was built.
Suite 1113 passed, `ruff` clean, `mypy --strict src/ tools/` clean.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
`process_inbox(inbox_dir, bundle_dir, ingested_at, *, okf_type, gate)`:
per dropped file, bytes -> extract_text -> guard gate -> render -> collision
gate -> write -> index link. Returns an InboxResult whose four buckets
(persisted / quarantined / rejected / failed) are disjoint and complete, so a
file that vanished shows up as a missing entry rather than as nothing.
The guard is INJECTED rather than imported. The library calls no guard
function and makes no security decision: the Gate adapter returns a
GateDecision carrying the guard's own disposition value and the sanitized
text, and the flow only branches on it. That keeps the core dependency-free
while B2 (the guard's CI channel) is still open, and lets the persist and
refuse branches run deterministically against a test double.
Decisions taken with the operator this session:
- What is persisted is the gate's SANITIZED text, not the extracted text.
Screening one string and writing another would make the verdict a statement
about bytes nobody kept. `sanitize` is exported by the guard precisely for
callers composing the checklist themselves, so this is sanctioned API, not
a reimplementation. Door B has no model call, so the fenced text the
bookends produce for a transform is never persisted.
- Quarantine is reported apart from rejection. QUARANTINE_REVIEW means "hold
for human review" — an operator queue — where FAIL_SECURE is a decision.
No quarantine directory in v1; that stays an extension point.
Fails closed by construction: only the guard's non-blocking floor (`warn`)
persists, so a renamed member, a future disposition or an adapter typo lands
in `rejected` rather than being guessed safe.
One bad file never aborts the run. Only three conditions fail the whole run,
and each is wrong for every file at once: an invalid `ingested_at`, a reserved
`okf_type`, and a missing inbox directory.
New code `inbox_slug_collision`: two dropped files reducing to one generated
name are BOTH refused. Persisting one would let iteration order decide the
winner, and overwriting would lose the other's content.
Phase 1 primitives are reused, never duplicated, so four helpers become
package-internal names (write_bytes, link_in_index, parse_frontmatter,
INDEX_NAME) and link_in_index learns to append to an empty index — Door A
always seeds its index with bundle_summary, but Door B has no summary to
invent and must not open with a blank line.
