test(browser): record controlled Agent Task resource evidence

[seonghobae]

Partial implementation of #28, stacked on PR #71.

Buyer-visible gap

Issue #28 requires real browser/task RSS, observation bytes, action latency and task duration. PR #70/#71 prove real pinned-Chromium task execution plus browser-computed role/name evidence, but the runtime evidence previously lacked measured resource fields.

Dependency

This Draft is stacked on unchanged exact PR #71 head 5f1f972f3e9888faa44af184fd54a466d20b6ddb and must remain Draft while #71/#70/#65 are active.

TDD / RCA sequence

1. Exact test-only head a9402a13c9ed429b8f3be2c623b994a0dfda3bb4 required strict Linux /proc/<pid>/status RSS parsing/sampling, ChromeDriver-issued goog:processID, and bounded browser_process_rss_bytes, semantic_observation_bytes, action_latency_ms, and task_duration_ms evidence.
2. CI run 31454745237, Rust contracts job 93666110420, checked out that exact test-only head and failed at the intended repository contract because _parse_linux_proc_status_rss_bytes did not exist. This is the observed RED boundary.
3. Current exact head 1a7186085abe926c1d0e5b22c36760965d6e237b implements only the bounded evidence boundary: strict positive single-VmRSS parsing with unit/shape/u64 overflow rejection; bounded /proc/<pid>/status reads for the ChromeDriver-issued browser PID; exact UTF-8 JSON byte size for the two controlled role/name observations; monotonic clear/type/click action latency; and end-to-end task duration. Invalid/missing process identity or malformed resource evidence fails closed.

Exact-head proof

On exact head 1a7186085abe926c1d0e5b22c36760965d6e237b against unchanged exact prerequisite #71 head 5f1f972f3e9888faa44af184fd54a466d20b6ddb:

• CI run 31454903615: success, including Python repository contracts, canonical formatting, locked workspace/all-target check, full tests, strict Clippy, rustdoc and exact owned production function/line/region/branch coverage;
• pinned real-browser run 31454903620, job 93666566904: success on Ubuntu 24.04 using Chrome for Testing 150.0.7871.129 / revision r1639810;
• Agent Task repeats 3/3, pass rate 1.0;
• measured browser-process RSS per trial: 215326720, 214568960, 213716992 bytes;
• bounded semantic observation size: 95 bytes in each trial;
• clear/type/click action latency: 133.282, 130.186, 110.554 ms;
• end-to-end task duration: 1144.545, 957.991, 906.982 ms;
• every trial also preserves semantic verification, exact post-condition, input echo, extensions-disabled execution and profile cleanup;
• bounded evidence artifact mv3-compatibility-1a7186085abe926c1d0e5b22c36760965d6e237b, artifact ID 9087662526, uploaded artifact SHA-256 a7f8ec5ae716ed723e9dd7ec84eeac3478c30fddd6eb7c9bf0d411f1a8990ee5;
• CodeRabbit exact-head commit status: success; and
• GitHub reports the Draft mergeable against its unchanged prerequisite base.

No predecessor-head result is transferred.

Truth boundary

This lane is execution evidence only. browser_process_rss_bytes is intentionally narrower than task RSS: a single ChromeDriver-reported browser PID does not attribute Chromium renderer/GPU/utility descendants and must not be presented as whole-browser or whole-task RSS. Full multi-process attribution still belongs to a trusted adapter/process-set boundary that composes the existing #51/#66 resource contracts. semantic_observation_bytes measures only the bounded controlled role/name evidence serialized by this runner; it is not raw DOM size, model-context cost, source-node/network provenance, or product SemanticNodeObservation composition. No GPU/VRAM/local-AI evidence, production browser adapter, policy dispatch, or real-site compatibility is claimed.

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