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

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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
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tegwick 2026-09-27 23:21:02 +02:00
parent 884803cdf5
commit fad8abdc2c
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25
research/evolution/EvolutionReport.md
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@ -51,19 +51,20 @@ Ten selected retrospective outcomes (not a historical census), followed by prosp
| Outcome | Entries (not independent discoveries) |
| --- | ---: |
| corroboration | 3 |
| corroboration | 4 |
| inconclusive | 0 |
| merge | 0 |
| rejection | 0 |
| revision | 13 |
Cycles with recorded research effort: 6/16. Unknown effort is neither zero nor estimated from commits, tokens or assertion counts.
Cycles with recorded research effort: 6/17. Unknown effort is neither zero nor estimated from commits, tokens or assertion counts.
### Stream B / B-independent-navigation-source-v1
| Cycle | Outcome | Research minutes | Consequential outcome/hour |
| --- | --- | ---: | ---: |
| LEARN-0014 | revision | 6.345 | 9.46 |
| LEARN-0017 | corroboration | unknown | unknown |
One bounded question counts at most one consequential outcome. Corroboration and inconclusive work remain visible separately. Fewer than three comparable cycles: no trend assessment.
@ -256,8 +257,9 @@ Make a navigable state reconstructible from its URL.
| runtime | htmx in authored public-catalog fixture | NH01–NH06: native/enhanced routes, history hit/miss, actual browser cache ordering and missing-Vary negative control; explicit Node validator checks separate. | [NavigationHistoryExperiment](../../research/reviews/NavigationHistoryExperiment.md) |
| runtime | htmx in authored public-catalog fixture | NO01–NO06: ordered history/success/error races, prior policy 0/12 full obligations versus guarded 12/12; separate focus ownership. Same fixture family; pinned history-XHR adapter. | [NavigationOwnershipExperiment](../../research/reviews/NavigationOwnershipExperiment.md) |
| static-code | Zulip | ZN01–ZN08 at pinned revision: partial hash/list/cache mechanisms and non-modal continuation contrast. No application/test execution, no no-script claim, no complete pattern recurrence. | [ZulipNavigationSourceStudy](../../research/reviews/ZulipNavigationSourceStudy.md) |
| static-code | Zulip | ZT01-ZT04: traced target-message-lookup and anchor-navigation continuations to their unconditional completion points; no captured-list guard or test coverage located. No reproduction or application execution. | [ZulipTargetLookupCallPath](../../research/reviews/ZulipTargetLookupCallPath.md) |
Open limits: Independent application recurrence and human/AT validation remain unverified. Pending history disclosure, multiple history misses, redirects, nonzero swap delays, bfcache, lifecycle cleanup, interrupted/late enhancement and offline availability remain open. Zulip auxiliary target/anchor callbacks, deferred editing focus and search callback wiring remain unverified; static guards do not prove whole-application ownership.
Open limits: Independent application recurrence and human/AT validation remain unverified. Pending history disclosure, multiple history misses, redirects, nonzero swap delays, bfcache, lifecycle cleanup, interrupted/late enhancement and offline availability remain open. Zulip's target-lookup and anchor-navigation continuations have a traced absence of a captured-current-list guard and no located test coverage for a stale-navigation race (unreproduced, not a defect claim); deferred editing focus and search callback wiring remain separately unverified.
Superseded by: none recorded.
@ -275,8 +277,9 @@ Keep essential actions usable when enhancement is unavailable.
| runtime | htmx in authored public-catalog fixture | NF01–NF06: Tab/Enter navigation, raw versus authored focus/status policy, held-response ownership and background update; DOM evidence only, not AT speech. | [NavigationFocusExperiment](../../research/reviews/NavigationFocusExperiment.md) |
| runtime | htmx in authored public-catalog fixture | NO01–NO06: ordered history/success/error races, prior policy 0/12 full obligations versus guarded 12/12; separate focus ownership. Same fixture family; pinned history-XHR adapter. | [NavigationOwnershipExperiment](../../research/reviews/NavigationOwnershipExperiment.md) |
| static-code | Zulip | ZN01–ZN08 at pinned revision: partial hash/list/cache mechanisms and non-modal continuation contrast. No application/test execution, no no-script claim, no complete pattern recurrence. | [ZulipNavigationSourceStudy](../../research/reviews/ZulipNavigationSourceStudy.md) |
| static-code | Zulip | ZT01-ZT04: traced target-message-lookup and anchor-navigation continuations to their unconditional completion points; no captured-list guard or test coverage located. No reproduction or application execution. | [ZulipTargetLookupCallPath](../../research/reviews/ZulipTargetLookupCallPath.md) |
Open limits: Independent application recurrence and human/AT validation remain unverified. Pending history disclosure, multiple history misses, redirects, nonzero swap delays, bfcache, lifecycle cleanup, interrupted/late enhancement and offline availability remain open. Zulip auxiliary target/anchor callbacks, deferred editing focus and search callback wiring remain unverified; static guards do not prove whole-application ownership.
Open limits: Independent application recurrence and human/AT validation remain unverified. Pending history disclosure, multiple history misses, redirects, nonzero swap delays, bfcache, lifecycle cleanup, interrupted/late enhancement and offline availability remain open. Zulip's target-lookup and anchor-navigation continuations have a traced absence of a captured-current-list guard and no located test coverage for a stale-navigation race (unreproduced, not a defect claim); deferred editing focus and search callback wiring remain separately unverified.
Superseded by: none recorded.
@ -613,3 +616,17 @@ Evidence: [ZulipAcceptanceProjection](../../research/reviews/ZulipAcceptanceProj
Remaining uncertainty: Ten selected source/test files from one existing Zulip family, no application/database/upstream test execution or full-contract recurrence. Response/event ordering, lost response after acceptance and current-edit ownership need preregistered reproduction; no defect or safe-replay claim. Six prospective groups are not a comparable trend; original human and milestone gates remain open.
Supersedes: none recorded.
### LEARN-0017 — Do Zulip's target-message lookup and anchor-navigation fetch continuation guard against a stale navigation that occurred while the request was in flight, the way the main narrow-fetch continuation (ZN02) does?
2026-09-27 · stream B · prospective · corroboration
Before: ZN07 located both callbacks and noted no visible captured-current-list guard, but did not trace their callers or check test coverage.
Conclusion: Traced both continuations to their concrete completion points: process_result calls opts.cont unconditionally, and neither the target-lookup channel.get nor load_messages_around_anchor supplies opts.msg_list, so neither participates in the opt-in list-identity guard that message_fetch.ts implements for other callers. No located test exercises a stale-navigation scenario for either path.
Evidence: [ZulipTargetLookupCallPath](../../research/reviews/ZulipTargetLookupCallPath.md), [ZulipTargetLookupSources](../../research/reviews/ZulipTargetLookupSources.json), [2026-09-27-zulip-target-lookup-effort](../../research/evolution/cycles/2026-09-27-zulip-target-lookup-effort.json).
Remaining uncertainty: Static source trace only; no application, database or upstream test executed, and no race actually reproduced. show() performs its own state reset on entry, so a stale re-entry's externally observable effect is unverified without execution. Second cycle in comparison group B-independent-navigation-source-v1; still short of three comparable cycles, and the workplan's rule against manufacturing cycles to reach that count still applies.
Supersedes: none recorded.