Take the import census ahead of the engine, and stop re-walking a finished ladder (issue 105)

[PatrickSt1991]

What the build-283f3e9 report said

The AU7200's page from build-283f3e9 (issue 105) has no engine imports: line. The previous-run block shows why: the early walk reached its verdict in 248 ms, the engine failed as before, and the post-failure thread started the walk again; its last line is probe: open res/, with no header read behind it, no deadline miss five seconds later and no heartbeat tick ten seconds later. The launch was over within five seconds of ENGINE FAILURE, the Q80's shape, and the census was queued behind that second walk. The second launch (the this run block) shows three lines and no UI, exactly as the build-3996334 page did, so on this set the only page served is the no-provider page, which carried neither build : nor the census.

Changes

• NativeProbe: a walk whose verdict is already on the books (this launch or an earlier one) says verdict already on the books — …; not walking again and asks nothing. Standing() and EngineFailedHere() expose the ledger's state.
• EngineImports: RunInBackground and WaitForCensus; the census is claimed under the lock before the thread starts.
• BrowserApp (elm): on an install whose ledger records the engine's failure, the census runs after the walk and ahead of the engine, waited for up to 60 s, on the walk's own reasoning.
• DiagServer: the no-provider page carries build :, engine imports: and the stub block.
• Program (elm): Elementary: initializing breadcrumb before the call the second launch stops in front of.
• NuiMseWatch (issue 100, FUSIONOF's build-644c119 trails): loadedmetadata carries dur …, and loadstart/playing say live page while the address is /@user/live, read-only, so the next freeze trail can say whether the on-screen element held a live stream.
• docs/INTERNALS.md: new subsection The census has to go ahead of the engine too, state of App doesn't load on Samsung AU7200 (Tizen OS 6.0) #105 updated, the Videos stops playing after few seconds on tiktok site #100 bullet updated with the reading of both trails and what the next report decides.

Checks

• tools/probeladder/run.sh: all ten scenarios pass (resume, peek, early, notearly updated to the no-re-walk behaviour).
• tools/engineimports/run.sh: passes, with the new background scenario (which found the claim race in the first version).
• tools/msewatch/run.sh: passes, with the duration line held.
• ./build.sh all and the OverscanProbe build: clean.

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