filter(ansible): add ansible-playbook filter

[mpecan]

Goal

Add a filter for ansible-playbook — one of the most widely used configuration management and automation tools, with notoriously verbose CI output.

Background

Every Ansible task emits at minimum two lines per host: the task name header and the result. A playbook with 100 tasks across 50 hosts generates 5,000+ lines, the vast majority being ok: [hostname] (no change occurred). In CI, these overwhelm the actual signal.

The meaningful lines are:

• changed: [hostname] — something was modified (worth knowing)
• failed: [hostname] — something broke (critical)
• fatal: [hostname] — unrecoverable failure (critical)
• PLAY RECAP — the final summary

ok and skipping lines represent zero new information in post-run review.

Filters to Add

ansible/playbook.toml — ansible-playbook

• Skip:
  • ok: [hostname] result lines
  • skipping: [hostname] result lines
  • TASK [role : task name] ****... header lines for tasks that resulted in ok or skipping
• Keep:
  • changed: [hostname] result lines (with their preceding task header)
  • failed: [hostname] result lines (with preceding task header)
  • fatal: [hostname] result lines
  • PLAY RECAP section and all lines within it
  • PLAY [play name] headers
  • Lines containing msg: from failed tasks (the error message)

Consider section parsing: track each TASK [...] header, then decide to keep or discard based on whether the result line is ok/skipping vs changed/failed/fatal.

ansible/lint.toml — ansible-lint

• Skip: [WARNING] lines from rules at warning severity when error level violations exist
• Keep: All violation lines with rule ID and file:line reference, summary

Fixture Files Needed

• tests/fixtures/ansible/playbook-allok.txt — large playbook run with all tasks ok
• tests/fixtures/ansible/playbook-changes.txt — playbook with mix of ok, changed, skipping
• tests/fixtures/ansible/playbook-failure.txt — playbook with a task failure
• tests/fixtures/ansible/lint-violations.txt — ansible-lint output with errors and warnings

Acceptance Criteria

• ok: and skipping: task result lines removed from output
• changed: lines and their task headers preserved
• failed: / fatal: lines and their task headers and error messages preserved
• PLAY RECAP section always fully preserved
• Integration tests pass for all fixture files