[JacobStephens2]

Summary

Give the Trial module one complete operation and apply the saved Bar's retry rules during recovery.

workers: alternating Arm queue, two workers, dispatch gates
  Trial Runner.run(Eval task, Arm, index)
    resume pending history under the saved Bar
    execute a fresh attempt when eligible
      publish attempt → pending history → terminal result
      keep Trace and active evidence live through publication
    checkpoint before pausing; never replay a retained pause

Closes #1309

Evidence

• Before: cargo test --test experiments retained_pending_history_obeys_the_saved_void_cause_list -- --exact failed: resume launched 4 attempts when the saved Bar allowed only the 2 retained attempts.
  After: the same regression passes with 2 attempts and retained terminal Void results.
• cargo check --all-targets passed.
• cargo test --bin thirdshift evals::experiment:: passed: 49 tests, including complete Trial recovery/publication, execution cleanup, retained readers, Model Scores and rechecks.
• cargo fmt --check and git diff --check passed.
• scripts/affected-tests main passed: all 50 site tests and the full Rust suite, including 80 Experiment command regressions (one fixture entry ignored). It used the documented cargo test fallback because nextest is unavailable.
• /usr/bin/time -p scripts/affected-tests main: 1420.54 seconds wall time (23m 40.54s), including site checks and 40.99 seconds of Rust compilation. Output is retained as .thirdshift-review-CxJABh/affected-tests.log.
• CI passed on 8b6d7ad5, including Linux tests, the macOS gate, site and Console checks.

Test seams

• Complete prepared Trial runner, with scripted scoped execution and real temporary storage, observed through retained Trial results and pending histories.
• Single-attempt execution completion callback, including evidence lifetime and cleanup on callback errors.
• Experiment CLI commands, including fixed-Bar resume and two-worker scheduling.
• Existing retained-result reading, Model Score application and recheck interfaces.

Review coverage

Independent Standards and Spec reviews against main each found 0 issues and read all 13 changed files. Unread changed files: none. Generated-output exclusions: none; both reviewers inspected the generated documentation hunk. Reports are retained with this session as .thirdshift-review-CxJABh/standards.md and .thirdshift-review-CxJABh/spec.md.

Unaddressed findings

• Standards: none.
• Spec: none.
• Security: none.

Security review outcome

No unaddressed introduced findings.

Merge Danger

Door: two-way

Internal ownership changes preserve the retained format, filenames and Experiment commands. Recovery now obeys older saved cause lists and cannot gain extra attempts after terminal-publication failure.

Blast Radius: Experiments

Retry, pause and publication behavior for Trials; ordinary Ticket runs are unaffected.

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