Initial commit: SWOOSH bootstrap with statechart spec, OpenAPI, ADRs, and ops harnesses

CONTRIBUTING.md

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+# Contributing to SWOOSH
+
+## Development Principles
+- Determinism over convenience; auditability over cleverness.
+- Pure reducers + side-effect adaptors.
+- Every state advance must be justified by guards and logged to WAL with UCXL DR refs.
+
+## Workflow
+1. Propose changes via RFC in `/rfc`.
+2. Link to issues/spec deltas in `/spec` and update statechart if needed.
+3. Submit PR with tests (unit + model-based + chaos sim).
+
+## Commit Messages
+Use: `CHORUS-<CAT>-###: short desc` and include UCXL backlink if applicable.