docs(audit): runtime-validate C-4 & C-11, close nougat.py review

Exercised the two runtime-confirmable HIGHs against real code paths (injected
fake LLM, no Ollama/DB):
- C-11 CONFIRMED: 4 distinct leads -> 2 files; connection+gap L-0001 silently
  overwritten by improvement L-0001 (2/4 leads lost).
- C-4 CONFIRMED: zero-claim (uncited) page published to wiki/ + marked compiled,
  not quarantined (grounding_rate=0.0 < 0.5 but total_claims>0 guard skips it).
- nougat.py now fully reviewed -> folds into R-6 (only retries ConnectError,
  wait_fixed(0), unwrapped in ingest). No new finding.

Audit/finding-identification pass complete; remediation planning still open.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

docs/audit/AUDIT-2026-06-15-full-repo.md

@@ -483,10 +483,11 @@ cluster into five root themes, not random scatter.
 - **Then:** MED batch (R-1, R-8, R-9, C-15, C-10) and the LOW polish.
 
 ### Coverage honesty
-Every `codex/` module was read. Not deep-reviewed: `nougat.py` (54-line `.pdf`
+Every `codex/` module was read. After the follow-up pass **all are deep-reviewed**
-wrapper, skimmed), and the exact runtime DB state (URL-form ids in C-7, and the
+(`nougat.py` included — see Runtime Validation). Runtime state that was initially
-`paper_identifiers` existence in M-1) is **inferred from code** and flagged
+*inferred from code* (C-7 id-form, M-1 table existence, and the C-4/C-11
-"confirm on the Jetson DB" — I could not query the live database from here.
+behaviours) has since been **empirically confirmed** — see the *Live DB
+Verification* and *Runtime Validation* sections below.
 
 ---
 
@@ -535,3 +536,34 @@ HIGH **8 → 7** (M-1 → MED). C-7 and C-1 are now **confirmed**, not inferred
 should lead remediation. The dominant root theme (**un-normalized identity**) is
 empirically validated: 35/36 ids in the "wrong" form, 13 papers mis-classified by
 the older code path, 57 edges rescued by the newer one.
+
+---
+
+# Runtime Validation — 2026-06-15 (C-4 and C-11 reproduced end-to-end)
+
+The two HIGH findings flagged "code-certain, runtime-confirmable" were exercised
+against the **real** code paths (injected fake LLM; no Ollama, no DB needed).
+
+### C-11 — CONFIRMED ✅ (lead-ID collision → silent loss; stays HIGH)
+Reproduced the exact CLI assembly (`cli.py:421` `connections + gaps +
+improvements`, each stage numbered from `L-0001`): **4 distinct leads** (2
+connection, 1 gap, 1 improvement) → `write_leads` produced **2 files**.
+`grounded/L-0001.md` survived as the **improvement** ("IMPROVEMENT-one"); the
+connection and gap `L-0001` were silently overwritten. **2 of 4 leads lost.**
+
+### C-4 — CONFIRMED ✅ (zero-claim page bypasses quarantine; stays HIGH)
+Drove the real `compile_all` with a fake LLM returning confident **uncited** prose
+(→ 0 parseable claims). With `wiki_min_grounding_rate = 0.5` and an actual
+grounding rate of `0.0`, the page was **published to `wiki/` and marked
+compiled** (`report.compiled=['test-concept']`, `report.quarantined=[]`) — not
+quarantined to `wiki/draft/`. The `total_claims > 0` guard (`wiki.py:730`) is the
+exact bypass; the bug fires precisely when grounding evidence is weakest.
+
+### `nougat.py` — now fully reviewed (no new finding)
+Folds into **R-6** (PDF-path resilience). Detail: `pdf_to_markdown` retries **only**
+`httpx.ConnectError` with `wait_fixed(0)` (no 5xx retry, no back-off) and is
+unwrapped at `ingest.py:183` — a Nougat 5xx aborts PDF ingest.
+
+**Closure:** every `codex/` module is deep-reviewed; the two runtime-confirmable
+HIGHs are empirically reproduced. The **audit / finding-identification pass is
+complete**. Remediation planning is the open next phase.