Capture worker startup phases before integration cleanup

[rmcdaniel]

Refs #123.

The ordinary task-family driver counts primary-client poll starts but loses request timing and handler progress. A fatal worker can remain unnoticed while the driver waits for a result, and a failed stop previously skipped its runner drain.

This test-only change:

• Captures bounded recent/in-flight HTTP metadata across primary and cloned clients, without headers, query strings, payloads, task tokens or error messages.
• Uses published worker interceptor hooks plus test-handler milestones to distinguish task delivery from handler entry/return.
• Reports failure state before cleanup and preserves the original failure when shutdown also fails.
• Surfaces a fatal worker while the original result wait is pending, and drains runners even if stop fails.
• Preserves the existing six split/mixed/timer cases, 30-second result/startup limits, 10-second shutdown wait and two-second durable timers.

The observer/driver component at 1df8875c63a0215432de37ae4ae8eb8af7e847aa passes twelve constructed controls and Ruff. These include additional-client capture, streaming preservation, credential/payload omission, bounded records, cancellation, fatal-worker propagation and cleanup. A two-runner counterfactual fails the initial helper because it skipped its pending peer; the corrected helper drains both. The actual Client.register_worker() contract also caught a registration-route misclassification, which is corrected and now asserted in every real case.

Final head e13e687e1b46c8eaef768483e3b7106ffc3557cb / tree bb669b979b01a9484801a626c8667743480cc698 changes only two exception-test setups after Sonar's S5778 review. The observer and integration driver exactly match the installed-qualified component. Sonar39011919697/official app reports0 OPEN/CONFIRMED PR findings; the previous green gate had two actionable findings, which were reviewed and fixed. No rule/profile/threshold change. Exact final-head CI39011919717 passes all10 jobs. Merged at 0d33fba37470ebb0a6b292c8e3e3f0e08ec2c61a with the identical reviewed tree and exact parents91c9ee8/e13e687. Independent main CI39012437645 also passes all10 jobs, including HTTP integration. Main Sonar39012437631/App and boundary39012437578 pass. The two new observer files have0 OPEN/CONFIRMED main findings; no zero-backlog claim. Merged remote head is independently404.

Published-package check

Normally installed PyPI 2.5.15, source 35aad4ab344cf13e01de3e5f4704380eac1532a6, has all34 package files verified against its immutable source. No editable/path/version substitution. Python3.12 / httpx0.28.1 / fastavro1.13.1, against unchanged published Server2.6.1 / installed Workflow2.5.12, index sha256:ef043e5c582761e486a64a2ab4226476e17ae4f71682ef59d6b9ddd784d246b6, MySQL8.0.43 and Redis7.

• Fresh final-source split/mixed/timer × run/run_until: 6 pass, 25.68seconds total, original30s/10s limits and2s durable timers unchanged. This is functional qualification, not a comparative performance claim.
• Eight successful registration replies and eight successful deletions, including all additional query-client requests; every case ends with0 in-flight requests. Slowest registration reply89.54ms. Workflow handler milestones are present for all cases, and each of the four activity cases records one activity invocation.
• Stopped-service SQL verifies6 completed original runs,4 first-attempt activities,18 completed first-attempt tasks (12workflow/4activity/2timer),34 history events,0 repairs,0 failed jobs and0 worker registrations.
• API and queue worker explicitSIGTERM exit0/noOOM. The maintenance shell required explicitSIGKILL137/noOOM; this is no graceful-maintenance qualification.

The preceding six-case cohort passed business execution but did not distinguish POST registration from control requests. Its observer limitation remains explicit; fresh final-source originals supply the registration result above. No old failure is relabeled.

All local phase containers, networks, data,72MiB dependencies and raw logs were independently absent at06:56:52UTC, before07:15; borrowed images remain protected. Exact candidate and independent main source/HTTP/Sonar checks pass. No package release is needed for these test-only changes.

The original unconstrained stalls remain unexplained. This is improved integration evidence, not an SDK/runtime cause or fix claim. No package source, dependency, version, protocol or publication change.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud