feat(v2): add output and detect packages

- internal/output: JSON response types, error codes, exit codes, pretty output
- internal/detect: auto-detection of project type (static/docker/binary)
- PROGRESS.md: track rebuild progress

Foundation for agent-first JSON interface per SPEC.md

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+# Ship v2 Rebuild Progress
+
+Tracking rebuilding ship for agent-first JSON interface.
+
+## Status: IN PROGRESS
+
+## Completed
+- [x] Design docs (SHIP_V2.md, SPEC.md)
+
+## Current Phase: Foundation
+- [ ] JSON output types and helpers
+- [ ] New CLI structure (`ship [PATH]` as primary)
+- [ ] Auto-detection logic
+- [ ] Error codes
+
+## Upcoming
+- [ ] Deploy flows (static, docker, binary)
+- [ ] Health checks
+- [ ] TTL support + cleanup timer
+- [ ] `ship host init` (update to match spec)
+- [ ] `ship list/status/logs/remove` with JSON output
+
+## Commits
+<!-- Log of commits as we go -->
+
+---
+
+## Notes
+- Branch: `agent-mode`
+- Keep v1 code for reference until v2 is working
+- Test with real deploys before merging to main