Fix rig lint conflict marker false positives

[chubes4]

Summary

• Fix rig package lint false positives where vendored dependency files and fixture/banner content were reported as unresolved conflict markers during Lab/offloaded rig check pipelines.
• Exclude standard dependency/generated directories from generic rig package lint traversal.
• Tighten conflict-marker detection to require a real Git conflict block shape instead of any line containing marker-like separators.

Details

The Lab offload SSI fixture matrix hit false unresolved-conflict-marker findings in paths like vendor/psr/event-dispatcher/README.md and transformer fixture CSS banners. Those are not source conflict markers: dependencies should not be source-linted, and banner/heading separator lines should not match unless they form an actual Git conflict block.

This keeps Homeboy core product-agnostic by using generic directory conventions and precise Git marker parsing, with no SSI-specific paths.

Verification

• cargo test core::rig::lint
• cargo build
• cargo clippy --all-targets --all-features -- -D warnings (fails on existing unrelated repo-wide clippy warnings outside this change; no failures from src/core/rig/lint.rs)

Tests

• CSS banner comments and Markdown heading/separator lines are not flagged.
• Vendored README content under vendor/ is not scanned.
• A real <<<<<<< / ======= / >>>>>>> conflict block is still flagged.

AI assistance

• AI assistance: Yes
• Tool(s): opencode with Claude Fable 5 orchestrator and GPT-5.5 subagents
• Used for: Diagnosing the rig conflict-marker lint false-positive, implementing the generic heuristic/exclusion fix, and drafting tests/PR notes.

[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 df337e4

Artifacts and drill-down

• CI results artifact: homeboy-ci-results-homeboy-review-lint-homeboy-Linux contains immediate command JSON for this action invocation.
• Observation artifact: homeboy-observations-homeboy-review-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/28800910448

Audit

✅ review audit — passed

• structural — 28 finding(s)
• field_patterns — 16 finding(s)
• core_boundary_leak:core-agnostic-source — 9 finding(s)
• test_quality — 5 finding(s)
• Types — 3 finding(s)
• dead_code — 2 finding(s)
• docs — 2 finding(s)
• command_status_contracts — 1 finding(s)
• compiler — 1 finding(s)
• intra-method-duplication — 1 finding(s)
• Total: 69 finding(s)

Deep dive: homeboy review audit homeboy --changed-since df337e4

Artifacts and drill-down

• CI results artifact: homeboy-ci-results-homeboy-review-audit-homeboy-Linux contains immediate command JSON for this action invocation.
• Observation artifact: homeboy-observations-homeboy-review-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/28800910448

Tooling versions

• Homeboy CLI: homeboy 0.281.16+e0013f234ef0-dirty+e0013f234
• Extension: rust from https://github.com/Extra-Chill/homeboy-extensions
• Extension revision: 256c32b3
• Action: unknown@unknown