feat(source): add Kilo Code adapter

[ayagmar]

Objective

Add a kilocode source adapter for Kilo Code task logs, reusing the same parsing path as Roo Code instead of introducing duplicate logic.

Source shape to support

• directory-backed task source under .../kilocode.kilo-code/tasks/**/ui_messages.json
• log shape mirrors Roo Code task logs
• sibling api_conversation_history.json can provide model/agent metadata
• task log payloads can include explicit cost and token counts

Implementation plan

1. Adapter file

   • add src/sources/kilocode/kilocode-source-adapter.ts
   • implement SourceAdapter with id = 'kilocode'

2. Shared parser strategy

   • do not copy/paste Roo Code parsing logic
   • either reuse a helper owned by the Roo Code source implementation or extract a small shared helper for Roo Code + Kilo Code task-log parsing
   • keep one decisive parsing path so future fixes land once

3. Discovery

   • discover ui_messages.json task files deterministically
   • keep the source directory-backed via --source-dir kilocode=...

4. Parsing

   • parse api_req_started task log entries only
   • preserve explicit cost and token counts
   • resolve sessionId from the task directory name
   • load sibling api_conversation_history.json when available for model/agent metadata
   • if shared helper uses sibling metadata, make sure parse dependencies include that file so cache invalidation remains correct

5. Wiring

   • register kilocode in src/sources/create-default-adapters.ts
   • update supported-source count/order/help expectations

6. Tests and docs

   • add tests/sources/kilocode-source-adapter.test.ts
   • prove shared-parser behavior with Roo Code rather than parallel implementations drifting over time
   • update shared registry/help tests and README.md

Code paths to touch

• src/sources/kilocode/kilocode-source-adapter.ts
• shared parser/helper used by Roo Code + Kilo Code
• src/sources/create-default-adapters.ts
• src/utils/discover-files.ts
• src/domain/usage-event.ts
• tests/sources/kilocode-source-adapter.test.ts
• tests/sources/roocode-source-adapter.test.ts or shared-helper coverage
• tests/sources/create-default-adapters.test.ts
• tests/cli/create-cli.test.ts
• README.md

Verification

• parser fixtures cover:
  • valid Kilo task logs
  • reuse of the shared task-log parser
  • sibling metadata extraction
  • explicit cost preservation
  • malformed/irrelevant entries skipped cleanly
• Roo Code and Kilo Code fixtures both pass through the same parser path
• llm-usage daily --source kilocode --source-dir kilocode=<fixture-dir> works
• full validation passes:
  • pnpm run lint
  • pnpm run typecheck
  • pnpm run test
  • pnpm run format:check