nightshift/docs/devlog/phase7.md

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# Phase 7 Devlog: Agent Executor
## Implemented
- Added `nightshift/agents.py`.
- Implemented the v1 `command` backend for agents.
- Loaded system prompt files through project-root-safe path resolution.
- Built compact prompt bundles containing system prompt, task markdown, acceptance criteria, project context, previous stage output, retry notes, and output contract.
- Passed prompt bundles to command agents on stdin.
- Captured stdout, stderr, exit code, duration, and timeout state.
- Persisted agent output and prompt artifacts through the artifact store.
- Parsed structured review-agent output into `StageResult`.
- Added fake-agent tests.
## Decisions Made
- Agent commands are command strings and run with `shell=True`, matching the Phase 6 command-string model. Unlike validation/test commands, agent commands are configured agent backends rather than allowlisted project commands.
- Agent stages pass when the command exits successfully. Review stages must emit a valid `status:` field or they fail.
- Prompt artifacts include the exact prompt sent to the agent to support auditability and prompt debugging.
## Notes
- Only the `command` backend is implemented. Ollama, Codex CLI, Claude Code, and API backends remain future integrations.