Retain nested run evidence across runner execution

[chubes4]

Closes #11849

Summary

• project bounded descendant run references from terminal runner results
• reject indirect cycles and forged or stale provenance
• expose child diagnostics without copying child artifacts

Verification

• focused runner-exec, runs-evidence, and evidence-report suites
• cargo check --workspace
• cargo fmt --check

AI assistance

OpenAI gpt-5.6-sol via OpenCode was used to implement, review, and verify this change. Chris Huber reviewed and is responsible for every line.

[homeboy-ci]

Homeboy Results — homeboy

Lint

✅ review lint — passed

ℹ️ Full options: homeboy self docs commands/lint
ℹ️ Save lint baseline: homeboy review lint homeboy --baseline
Deep dive: homeboy review lint homeboy --changed-since 7d4fedd

Artifacts and drill-down

• CI results artifact: homeboy-ci-results-homeboy-review-lint-homeboy-fast-Linux contains immediate command JSON for this action invocation.
• Observation artifact: homeboy-observations-homeboy-review-lint-homeboy-fast-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/31216767173

Audit

⚠️ review audit — no measurement

Deep dive: homeboy review audit homeboy --changed-since 7d4fedd

Artifacts and drill-down

• CI results artifact: homeboy-ci-results-homeboy-review-audit-homeboy-fast-Linux contains immediate command JSON for this action invocation.
• Observation artifact: homeboy-observations-homeboy-review-audit-homeboy-fast-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/31216767173

Tooling versions

• Homeboy CLI: homeboy 0.334.0+7b254fb1a364-dirty
• Extension: rust from https://github.com/Extra-Chill/homeboy-extensions
• Extension revision: 14fe68af
• Action: unknown@unknown