feat: add GitHub Copilot CLI as a new provider (#425)
* feat: add GitHub Copilot CLI as a new provider
Add support for GitHub Copilot CLI (@github/copilot) as a takt provider,
enabling the 'copilot' command to be used for AI-driven task execution.
New files:
- src/infra/copilot/client.ts: CLI client with streaming, session ID
extraction via --share, and permission mode mapping
- src/infra/copilot/types.ts: CopilotCallOptions type definitions
- src/infra/copilot/index.ts: barrel exports
- src/infra/providers/copilot.ts: CopilotProvider implementing Provider
- src/__tests__/copilot-client.test.ts: 20 unit tests for client
- src/__tests__/copilot-provider.test.ts: 8 unit tests for provider
Key features:
- Spawns 'copilot -p' in non-interactive mode with --silent --no-color
- Permission modes: full (--yolo), edit (--allow-all-tools --no-ask-user),
readonly (no permission flags)
- Session ID extraction from --share transcript files
- Real-time stdout streaming via onStream callbacks
- Configurable via COPILOT_CLI_PATH and COPILOT_GITHUB_TOKEN env vars
* fix: remove unused COPILOT_DEFAULT_MAX_AUTOPILOT_CONTINUES constant
* fix: address review feedback for copilot provider
- Remove excess maxAutopilotContinues property from test (#1 High)
- Extract cleanupTmpDir() helper to eliminate DRY violation (#2 Medium)
- Deduplicate chunk string conversion in stdout handler (#3 Medium)
- Remove 5 what/how comments that restate code (#4 Medium)
- Log readFile failure instead of silently swallowing (#5 Medium)
- Add credential scrubbing (ghp_/ghs_/gho_/github_pat_) for stderr (#6 Medium)
- Add buffer overflow tests for stdout and stderr (#7 Medium)
- Add pre-aborted AbortSignal test (#8 Low)
- Add mkdtemp failure fallback test (#9 Low)
- Add rm cleanup verification to fallback test (#10 Low)
- Log mkdtemp failure with debug level (#11 Persist)
- Add createLogger('copilot-client') for structured logging
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