YeonGyu-Kim 611eed1537 feat: #142 structured fields in claw init --output-format json
Previously `claw init --output-format json` emitted a valid JSON envelope but
packed the entire human-formatted output into a single `message` string. Claw
scripts had to substring-match human language to tell `created` from `skipped`.

Changes:
- Add InitStatus::json_tag() returning machine-stable "created"|"updated"|"skipped"
  (unlike label() which includes the human " (already exists)" suffix).
- Add InitReport::NEXT_STEP constant so claws can read the next-step hint
  without grepping the message string.
- Add InitReport::artifacts_with_status() to partition artifacts by state.
- Add InitReport::artifact_json_entries() for the structured artifacts[] array.
- Rewrite run_init + init_json_value to emit first-class fields alongside the
  legacy message string (kept for text consumers): project_path, created[],
  updated[], skipped[], artifacts[], next_step, message.
- Update the slash-command Init dispatch to use the same structured JSON.
- Add regression test artifacts_with_status_partitions_fresh_and_idempotent_runs
  asserting both fresh + idempotent runs produce the right partitioning and
  that the machine-stable tag is bare 'skipped' not label()'s phrasing.

Verified output:
- Fresh dir: created[] has 4 entries, skipped[] empty
- Idempotent call: created[] empty, skipped[] has 4 entries
- project_path, next_step as first-class keys
- message preserved verbatim for backward compat

Full workspace test green except pre-existing resume_latest flake (unrelated).

Closes ROADMAP #142.
2026-04-21 17:42:00 +09:00
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