fix(runner): keep workspace metadata out of git status

[chubes4]

Summary

Fixes #6908.

Homeboy now adds .homeboy/ to .git/info/exclude for Git-backed runner workspaces before writing .homeboy/runner-workspace.json. This keeps Homeboy-owned runner metadata from dirtying synthetic Lab checkouts while preserving the existing strict patch-capture preflight for real source changes.

Tests

• rustfmt --check src/core/runner/workspace/sync.rs src/core/runner/workspace/tests/snapshot.rs src/core/runner/lab/offload/tests/workspace_sync.rs
• cargo test snapshot_git_sync_materializes_dirty_source_as_synthetic_git_checkout
• cargo test required_git_checkout_preflight_accepts_homeboy_runner_metadata_when_excluded

Note: cargo fmt --check currently reports formatting diffs in unrelated files on origin/main, so this PR verified formatting on the touched files directly.

AI assistance

• AI assistance: Yes
• Tool(s): gpt-5.5 via OpenCode
• Used for: Diagnosing the runner workspace metadata cleanliness failure, implementing the fix, adding regression tests, and drafting this PR description.

[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 99cfcb4

Artifacts and drill-down

• CI results artifact: homeboy-ci-results-homeboy-lint-homeboy-Linux contains immediate command JSON for this action invocation.
• Observation artifact: homeboy-observations-homeboy-lint-homeboy-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/28336855503

Test

⚠️ test — baseline red

ℹ️ No tests ran — the runner failed before producing results. See raw_output.stderr_tail / raw_output.stdout_tail for the underlying error (bootstrap failure, missing deps, DB connection, etc.).
ℹ️ To run specific tests: homeboy test homeboy -- --filter=TestName
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 99cfcb4

Artifacts and drill-down

• CI results artifact: homeboy-ci-results-homeboy-test-homeboy-Linux contains immediate command JSON for this action invocation.
• Observation artifact: homeboy-observations-homeboy-test-homeboy-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/28336855503

Audit

✅ audit — passed

• core_boundary_leak:core-agnostic-source — 72 finding(s)
• structural — 58 finding(s)
• intra-method-duplication — 48 finding(s)
• field_patterns — 35 finding(s)
• dead_code — 19 finding(s)
• near-duplication — 17 finding(s)
• test_quality — 13 finding(s)
• duplication — 10 finding(s)
• remote_execution_preflight — 9 finding(s)
• thin_command_adapter — 8 finding(s)
• Total: 314 finding(s)

Deep dive: homeboy audit homeboy --changed-since 99cfcb4

Artifacts and drill-down

• CI results artifact: homeboy-ci-results-homeboy-audit-homeboy-Linux contains immediate command JSON for this action invocation.
• Observation artifact: homeboy-observations-homeboy-audit-homeboy-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/28336855503

Tooling versions

• Homeboy CLI: homeboy 0.269.2+f958423e4e6b+21bb7fde8
• Extension: rust from https://github.com/Extra-Chill/homeboy-extensions
• Extension revision: 846eeef8
• Action: unknown@unknown