chore(cli): prepare release v0.0.49

[cte]

CLI Release v0.0.49

This PR prepares the CLI release v0.0.49.

Changes

• Version bump in package.json
• Changelog update

What's New

• Output Format Options: New --output-format flag to control CLI output format for scripting and automation:
  • text (default) - Human-readable interactive output
  • json - Single JSON object with all events and final result at task completion
  • stream-json - NDJSON (newline-delimited JSON) for real-time streaming of events

Checklist

• Version number is correct
• Changelog entry is complete and accurate
• All CI checks pass

---

Important

Prepare CLI release v0.0.49 with version bump, changelog update, and new output format options.

• Version Update:
  • Bump version to 0.0.49 in package.json.
• Changelog:
  • Update CHANGELOG.md with details of version 0.0.49.
• New Feature:
  • Add --output-format flag for CLI with options text, json, and stream-json for different output formats.
  • Introduce JsonEventEmitter in json-event-emitter.ts for structured output.
  • Reference json-events.ts for event schema.

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[roomote]

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Review complete. No issues found.

This is a straightforward CLI release preparation with correct version bump (0.0.48 -> 0.0.49) and accurate changelog entry documenting the new --output-format feature.

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