Adds pkg/ratelimit for Gemini API rate limiting with sliding window
(RPM/TPM/RPD), persistent state, and token counting. Replaces the
bash agent-runner.sh with a native Go implementation under
`core ai dispatch {run,watch,status}` for local queue processing.
Rate limiting:
- Per-model quotas (RPM, TPM, RPD) with 1-minute sliding window
- WaitForCapacity blocks until capacity available or context cancelled
- Persistent state in ~/.core/ratelimits.yaml
- Default quotas for Gemini 3 Pro/Flash, 2.5 Pro, 2.0 Flash/Lite
- CountTokens helper calls Google tokenizer API
- CLI: core ai ratelimits {show,reset,count,config,check}
Dispatch runner:
- core ai dispatch run — process single ticket from queue
- core ai dispatch watch — daemon mode with configurable interval
- core ai dispatch status — show queue/active/done counts
- Supports claude/codex/gemini runners with rate-limited Gemini
- File-based locking with stale PID detection
- Completion handler updates issue labels on success/failure
Closes#42
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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