feat(source): add Kimi CLI adapter

[ayagmar]

Objective

Add a kimi source adapter for Kimi CLI wire logs.

Source shape to support

• directory-backed source under ~/.kimi/sessions/**/wire.jsonl
• token usage arrives on StatusUpdate messages inside the wire stream
• nearby config can improve model metadata
• repeated status messages may need deduplication

Implementation plan

1. Adapter file

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

2. Discovery

   • discover only wire.jsonl files rather than every JSONL in the tree
   • keep the adapter directory-backed and reachable via --source-dir kimi=...

3. Parsing

   • stream JSONL rows and process StatusUpdate messages only
   • derive sessionId from the path when the wire format does not supply a better stable identifier
   • if nearby config provides model metadata, load it in a narrow/safe way
   • expose that config file through getParseDependencies() so parse-cache invalidation stays correct when model config changes
   • normalize timestamps from numeric/float wire timestamps and fall back to file mtime when needed
   • skip zero-token updates
   • if the format can repeat identical message usage, deduplicate on a stable key rather than double counting
   • cost should stay estimated unless the source provides explicit cost

4. Wiring

   • register kimi in src/sources/create-default-adapters.ts
   • keep source selection/help output in sync with the new source id
   • use generic --source-dir support; no dedicated flag needed

5. Tests and docs

   • add tests/sources/kimi-source-adapter.test.ts
   • update registry/help tests and README.md

Code paths to touch

• src/sources/kimi/kimi-source-adapter.ts
• src/sources/create-default-adapters.ts
• src/utils/discover-files.ts
• src/utils/read-jsonl-objects.ts
• src/sources/parsing-utils.ts
• src/domain/usage-event.ts
• tests/sources/kimi-source-adapter.test.ts
• tests/sources/create-default-adapters.test.ts
• tests/cli/create-cli.test.ts
• README.md

Verification

• parser fixtures cover:
  • single-turn and multi-turn StatusUpdate streams
  • zero-token updates skipped
  • numeric/float timestamp normalization
  • config-assisted model resolution
  • parse dependency invalidation for the nearby config file
  • deduplication if the same message usage repeats
• llm-usage daily --source kimi --source-dir kimi=<fixture-dir> works
• full validation passes:
  • pnpm run lint
  • pnpm run typecheck
  • pnpm run test
  • pnpm run format:check