Support GitHub branch-ignore and path trigger filters

[gjkim42]

Context

GitHub Actions supports branches-ignore, paths, and paths-ignore filters for applicable push and pull_request events, with documented glob ordering, filter-combination rules, and changed-file diff behavior.

Open Actions rejects these keys as unsupported event filters, so otherwise valid workflows fail discovery. Push tag filters are tracked separately in #21.

Goal

Select workflow runs with the same branch and changed-path filtering behavior as GitHub Actions.

Acceptance criteria

• Parse and validate branches-ignore, paths, and paths-ignore only on the events where GitHub supports them.
• Enforce documented mutual-exclusion and combination rules for positive and ignore filters.
• Implement GitHub-compatible ordered glob and negative-pattern behavior.
• Combine branch or tag filters with path filters using GitHub-compatible AND semantics.
• Compute changed files using the documented two-dot, three-dot, and new-branch comparisons for each event type.
• Match documented behavior for deletions, renames, empty diffs, diff timeouts, commit-count thresholds, and changed-file limits.
• Preserve the documented observable check state when a required workflow is skipped by a filter.
• Add webhook and matching tests for push and pull request events, including negative patterns and the documented diff limits.
• Document supported syntax and link to Support push tag filters #21 for tag filter completion.

References:

• https://docs.github.com/en/actions/how-tos/write-workflows/choose-when-workflows-run/trigger-a-workflow
• https://docs.github.com/en/actions/reference/workflows-and-actions/workflow-syntax#onpushpull_requestpull_request_targetpathspaths-ignore

[kelos-bot]

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