The currency-anchored amount regexes treated a single-letter magnitude
suffix (k/m/b) as optional but unbounded, so "$5,000,000 but" scrubbed to
"[AMOUNT_1]ut" — the 'b' of "but" was consumed as a 'billion' suffix. Add a
word boundary after _MAG on the three currency-anchored _AMOUNT_RES patterns
(range, symbol, ISO-code); the worded-amount pattern is unaffected. Money
still tokenizes in every case ($5m/$5b/$3-5M/USD 5,000,000); only the OUTBOUND
to-Claude text stops losing the leading letter of the following word.
Round-trips were already lossless.
Regression-locked by a round-5 section in test_scrub_leak.py; full redaction
suite (scrub_leak + reidentification + grounding_boundary) green. Packaged as
StartOS v0.1.0:57. Reported by the Spark gateway dev; gateway re-vendored
scrub.py verbatim for parity (same golden-file leak test gates both sides).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Phase 1 Workstream D. Lets the Architect ground the thesis in REAL recurring LP
objections without any LP identity reaching the Claude API. Layered, defense-in-depth,
fail-closed by construction (docs/redaction-rehydration.md).
backend/redaction/:
- scrub.py: the leak-proof core. Drops Tier-1 (labelled/structured account/wire/SSN/
IBAN/SWIFT/passport, separator-tolerant); tokenizes known LP entities (dictionary from
the canonical layer, unicode-folded + hyphen-extended) and structured PII (emails,
scheme-less/social URLs, intl+ext phones, currency-cued amounts, ISO/worded/numeric/
quarter dates, addresses, bare long digit runs); pre-neutralizes injected [TYPE_N]
strings; single-pass rehydrate; metadata-only audit logging (the pseudonym map is the
de-anon key — local-only, never logged/sent). Hardened across THREE adversarial
leak-hunts (worded/coded amounts, intl phones, NFD/ligature/zero-width names, slash/
comma SSN, SWIFT, alpha-prefixed accounts, substance-preserving false-positive fixes).
- client.py: Boundary — one scrub/rehydrate contract, SCRUB_BACKEND=local (default) or
gateway (Spark Control /scrub + /rehydrate). Fails closed (db_path required; dictionary
build errors propagate; strict rehydrate returns tokenized-not-de-anon text).
- test_scrub_leak.py, test_reidentification.py: golden-file leak + re-identification
suites (synthetic only, guardrail #9), regression-locking every leak-hunt vector.
backend/mcp/architect_grounding.py: the flow — retrieve (local) -> minimize-first
(local Qwen) -> scrub (+ local-Qwen NER backstop for unknown names) -> Claude over the
de-identified register only -> re-hydrate locally -> human review. FAILS CLOSED if the
local model is unreachable or a hallucinated token appears. test_grounding_boundary.py
proves nothing sensitive reaches Claude and the three fail-closed paths.
server.py: POST /api/architect/ground (admin) wires retrieval -> ground_objections.
docker_entrypoint.sh: SCRUB_BACKEND (default local). docs/spark-control-scrub-endpoints.md:
the gateway handover spec (Option 1 — caller supplies the entity dictionary).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Keysat