Fix Lab rig bench snapshot resolution

[chubes4]

Summary

• Prefer the offloaded primary source snapshot when a Lab-offloaded rig exists in the current source tree, avoiding stale runner-side rig source metadata.
• Inject the primary snapshot as --path for Lab-offloaded bench --rig runs without an explicit path so default component resolution cannot fall back to a stale runner component checkout.
• Add Lab plan/metadata diagnostics for the source snapshot remote path and selected rig install sources.

Fixes #3933.

Tests

• cargo fmt --check
• cargo test core::runner::rig_materialization
• cargo test core::runner::lab::preparation_tests
• cargo test core::extension::bench::run::tests::attach_memory_timeline_adds_metrics_and_artifacts
• cargo test (one unrelated/flaky failure: core::extension::bench::run::tests::attach_memory_timeline_adds_metrics_and_artifacts; reran that single test and it passed)

AI assistance

• AI assistance: Yes
• Tool(s): OpenCode (GPT-5.5)
• Used for: Investigating the Lab offload rig resolution path, implementing the fix, and drafting regression tests. Chris remains responsible for review and validation.

[homeboy-ci]

Homeboy Results — homeboy

Lint

✅ lint — passed

ℹ️ Full options: homeboy docs commands/lint
ℹ️ Save lint baseline: homeboy lint homeboy --baseline
Deep dive: homeboy lint homeboy --changed-since 8f68bc8

Artifacts and drill-down

• CI results artifact: homeboy-ci-results-homeboy-lint-quality-Linux contains immediate command JSON for this action invocation.
• Observation artifact: homeboy-observations-homeboy-lint-quality-Linux contains exported Homeboy run history for deeper queries.
• Drill-down: download the observation artifact, then run homeboy runs import <dir>, homeboy runs list, and homeboy runs findings <run-id>.
• Artifacts are attached to the workflow run: https://github.com/Extra-Chill/homeboy/actions/runs/27285510963

Test

❌ test — failed

• 1 failed out of 4191 total
• 18 skipped

ℹ️ To run specific tests: homeboy test homeboy -- --filter=TestName
ℹ️ Set --setting require_phpunit_tests=true when this component is expected to contain PHPUnit tests.
ℹ️ Auto-fix lint issues: homeboy refactor homeboy --from lint --write
ℹ️ Collect coverage: homeboy test homeboy --coverage
ℹ️ Analyze failures: homeboy test homeboy --analyze
ℹ️ Pass args to test runner: homeboy test -- [args]
ℹ️ Full options: homeboy docs commands/test
Deep dive: homeboy test homeboy --changed-since 8f68bc8

Artifacts and drill-down

• CI results artifact: homeboy-ci-results-homeboy-test-quality-Linux contains immediate command JSON for this action invocation.
• Observation artifact: homeboy-observations-homeboy-test-quality-Linux contains exported Homeboy run history for deeper queries.
• Drill-down: download the observation artifact, then run homeboy runs import <dir>, homeboy runs list, and homeboy runs findings <run-id>.
• Artifacts are attached to the workflow run: https://github.com/Extra-Chill/homeboy/actions/runs/27277857864

Audit

✅ audit — passed

• core_boundary_leak:core-agnostic-source — 2 finding(s)
• field_patterns — 2 finding(s)
• structural — 2 finding(s)
• Runs (Tests) — 1 finding(s)
• intra-method-duplication — 1 finding(s)
• Total: 8 finding(s)

Deep dive: homeboy audit homeboy --changed-since 8f68bc8

Artifacts and drill-down

• CI results artifact: homeboy-ci-results-homeboy-audit-quality-Linux contains immediate command JSON for this action invocation.
• Observation artifact: homeboy-observations-homeboy-audit-quality-Linux contains exported Homeboy run history for deeper queries.
• Drill-down: download the observation artifact, then run homeboy runs import <dir>, homeboy runs list, and homeboy runs findings <run-id>.
• Artifacts are attached to the workflow run: https://github.com/Extra-Chill/homeboy/actions/runs/27285510963

Tooling versions

• Homeboy CLI: homeboy 0.227.9+ffc0ea20
• Extension: rust from https://github.com/Extra-Chill/homeboy-extensions
• Extension revision: 8758c05d
• Action: unknown@unknown