docs(PENDING-139): ADDENDUM 1 — (a) already landed; (b) needs an anchorless residual scan

Status correction the item's own Awaiting: line concealed — option (a) was built
2026-08-31 under REVIEWED-132 (PENDING-173 + ADDENDUM 1), and the code says so at
governance-drift-check.py:219. That also explains the standing 'built without a
ruling' flag: ruled under another item's entry, so no entry names this one.

The jurist's condition on (b), demonstrated against the module's own compiled
patterns with positive controls rather than predicted: RE_HEAD_LINE (^#{2,3}\s+)
and RE_INBODY (^\*\*…) both anchor at column zero. An indented heading is not
counted as unclassifiable — it is not counted at all, so the NOT-ESTABLISHED
figure cannot tick for it. A count of unclassifiable headings sharing the
classifier's anchor is a negative result with no positive control, in the
instrument built to catch that class. (b) must scan anchorless or it inherits
the blind spot it exists to close.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01T1i5VRfHjD79hfaXjWsBXA

PENDING.md

@@ -4593,3 +4593,57 @@ jurist's note that a ruling might not reach them.**
 > proposal was drafted, and it strengthens the argument the proposal makes from a single
 > 09-01 instance.**
 
+
+### ADDENDUM 1 — 2026-09-10 — Option (a) has LANDED under another item's ruling; and the jurist's condition on (b), demonstrated against built code
+
+**Filed by the executor at the jurist's direction**, which asked that the constraint below
+sit here as a **condition on option (b)** rather than in PENDING-181 as evidence for it.
+
+**⚠ FIRST, A STATUS CORRECTION THIS ITEM'S OWN `Awaiting:` LINE CONCEALS.** Option (a) —
+widen the header regex, accept `ADDENDUM` alongside `AMENDMENT`, cover `###` depth — **was
+built on 2026-08-31 under REVIEWED-132 (PENDING-173 + ADDENDUM 1)**, and the code says so
+at `governance-drift-check.py:219`. This item still reads *"**Awaiting:** Steward
+authorization"*, which is where the eye goes and the last thing anyone updates. **A dated
+measurement is not a status**, and the field that carries the staleness is the one the
+reader trusts most.
+
+⚠ **This also explains the standing `⚑ built without a ruling` flag against this item:**
+the work was ruled, but under **another item's** REVIEWED entry, so no entry names
+PENDING-139. The flag is correct and the breach it suggests is not there — **it is the
+record gap the check says it is.**
+
+**THE CONDITION ON OPTION (b), AND IT IS NOT A PREDICTION.** Option (b) is *"emit a count
+of amendment-like headings the parser could not classify, so a future unmatched form
+announces itself instead of vanishing."* Tested directly against the module's own compiled
+patterns, with positive controls:
+
+| input | `RE_HEAD_LINE` | `RE_INBODY` | `RE_MARKER_TOKEN` |
+|---|---|---|---|
+| `## REVIEWED-138 — …` **[positive control]** | **True** | False | False |
+| `  ## REVIEWED-138 — …` **[today's instance]** | **False** | False | **False** |
+| `**AMENDMENT 1 — …**` **[positive control]** | False | **True** | True |
+| `  **AMENDMENT 1 — …**` | False | **False** | True |
+
+`RE_HEAD_LINE` is `^#{2,3}\s+(.*)$` and `RE_INBODY` is `^\*\*(?:AMENDMENT|ADDENDUM)\b.*$`.
+**Both anchor at column zero. Neither admits leading whitespace, which CommonMark permits
+up to three of.**
+
+⚠ **SO THE FAILURE IS WORSE THAN "MISCLASSIFIED".** An indented heading is **not counted
+as unclassifiable — it is not counted at all.** It never enters the population the
+residual count is taken over, so **the NOT-ESTABLISHED figure cannot tick for it** and the
+instrument reports a clean line over a record it cannot see. **A count of unclassifiable
+headings that shares the classifier's anchor is a negative result with no positive
+control, in the instrument built to catch exactly that class.**
+
+**CONDITION, therefore, on any adoption of (b): the residual scan must be ANCHORLESS** —
+it must find candidate headings without `^`, and report anything the anchored classifier
+then fails to place. Written otherwise, (b) inherits the blind spot it exists to close and
+its silence means nothing.
+
+**Evidence it is live rather than theoretical:** REVIEWED-138 was placed on 2026-09-10
+with two leading spaces and was, for that window, invisible to this instrument, to
+`wake-digest.py`'s LAST RULINGS, and to `governance_item`. Full account at PENDING-181
+ADDENDUM 2. **Nothing in this item previously separated (a) from (b); this does.**
+
+**Awaiting:** Steward authorization on the options set, now reduced — **(a) is built, so
+what remains open is (b) with the condition above, or (c).**