feat(adapters): adapter contract, dispatch, pi + mock adapters (#16)
- adapters/README.md: the harness boundary contract (env in, response on stdout, diagnostics stderr, exit 0 success) - adapters/pi: extracted current invocation unchanged - adapters/mock: deterministic MOSAIC_MOCK_RESPONSE echo (test-only) - run-agent.sh: name-validated dispatch to adapters/<name>/adapter.sh - config: optional execution.adapter (pi|mock), default pi, configVersion stays 1 — existing configs remain valid; selection authority is the config file (load_config exports it) - compose: MOSAIC_ADAPTER / MOSAIC_MOCK_RESPONSE passthrough; Containerfile installs adapters read-only; RELEASE -> 0.0.5 Verified: hello unchanged; mock verbatim via config; unknown adapter and path-traversal names refused in-container; invalid adapter exits 2. Closes #16
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