Record LEARN-0017: traced Zulip target-lookup/anchor guard gap (corroboration)

Second cycle in comparison group B-independent-navigation-source-v1, a
naturally-motivated follow-up to LEARN-0014's ZN07 finding rather than a
manufactured repetition. Traces the target-message lookup and anchor-
navigation fetch continuation to their unconditional completion points in
message_fetch.ts: neither participates in the opt-in current-list-identity
guard used elsewhere in the same file, and no located test covers a
stale-navigation scenario. No reproduction or defect claim; static source
read only. CAND-0009/CAND-0010 evidence and gaps updated accordingly.

Declined to reopen the paused local navigation fixture to force a third
cycle in an existing group, per the prior agreed pause and WP-0006 T03's
own rule against manufacturing cycles to hit a count.

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

Assistant: claude-code
Assistant-Model: sonnet
Assistant-Process: 290719@bnt-lap001
Assistant-Session: 55cbe504-1bfe-4932-b761-29016523c87b

research/evolution/cycles/2026-09-27-zulip-target-lookup-effort.json

@@ -0,0 +1,11 @@
+{
+  "research_minutes": null,
+  "execution_minutes": null,
+  "reported_tokens": null,
+  "cost_usd": null,
+  "status": "complete",
+  "end_utc": "2026-09-27T21:18:08Z",
+  "method": "No wall-clock timer was started before inspection began; effort is left unknown rather than estimated from tool-call count, token usage or elapsed session time.",
+  "excluded": "Preregistration commit, repository-check subprocesses (make evolution-check evolution-test schema-test), final receipt/commit/sync administration.",
+  "budget": "Four-file cap, same tier as LEARN-0014; no expansion beyond the two flagged call paths and their two test files."
+}

research/evolution/cycles/2026-09-27-zulip-target-lookup.md

@@ -39,7 +39,23 @@ evidence tier and effort accounting).
 
 ## Outcome (complete after execution)
 
-Pending.
+- Evidence references, retained failures and counterexamples: see
+  [ZulipTargetLookupCallPath](../../reviews/ZulipTargetLookupCallPath.md) and
+  [source manifest](../../reviews/ZulipTargetLookupSources.json).
+- Changed understanding and applicability limits: corroborates and sharpens
+  ZN07 with a traced call path to its concrete completion point — see review.
+- Disposition: corroboration
+- Why this is one outcome, not a count of assertions/files: one bounded
+  question (guard presence and test coverage for two specific continuations),
+  answered with multiple located call sites as supporting detail.
+- Remaining uncertainty and live workplan/task: no reproduction, no defect
+  claim, no application/upstream test execution. WP-0003 T01 retains any
+  further reproduction; WP-0003 T02 retains independent review.
+- Superseded ledger entries, if any: none.
+- Active research minutes / execution minutes: unknown; no wall-clock timer
+  was started before inspection. See effort receipt.
+- Reported tokens / cost USD: unknown, not measured.
+- Reviewer name, role and independence: Codex, author-model, not independent.
 
 Append an entry to research/evolution/ledger.json with `recording: prospective` and
 `protocol_ref` pointing here. Update profiles, run evolution checks, then snapshot at