[feature-runner] Auto-selection and LOOP_COMPLETE

[orioltf]

This was generated by AI during triage.

Parent

docs/issues/feature-runner/PRD.md

What to build

Extend the skill to handle no-argument invocation. When invoked without a slug, scan docs/issues/ for features where every NN-*.md file is at Status: ready-for-agent. Select the first such feature alphabetically and run it. When no qualifying feature exists, emit LOOP_COMPLETE on its own line and exit cleanly. This makes /loop /implement-feature composable for overnight queue draining — the /loop skill catches LOOP_COMPLETE and terminates.

Acceptance criteria

• Running /implement-feature with no argument scans docs/issues/ and selects the first feature (alphabetically by slug) where all NN-*.md files are Status: ready-for-agent
• The selected feature is then executed using the same logic as the named-slug path
• When no qualifying feature exists, the skill outputs LOOP_COMPLETE on its own line and exits cleanly with no error
• Running /loop /implement-feature terminates cleanly after LOOP_COMPLETE is emitted
• Features with a mix of ready-for-agent and resolved/closed issues are not selected (partial features are skipped)

Blocked by

#80

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PRD: docs/issues/feature-runner/PRD.md
Migrated from: docs/issues/feature-runner/07-auto-selection.md (source removed after migration)
Touched by PRs: #25, #32