feat(runtime): integrate Python control plane adapter to Rust CLI

[ProfRandom92]

Objective

Integrate Python control plane adapter to Rust CLI (ctxt).

Adapter Implementation & Boundaries

• Implemented canonical Python adapter (modules/runtime/cli_adapter.py) using subprocess.run(shell=False) with restricted allowlist environment (PATH, SYSTEMROOT, TEMP/TMP, COMPTEXT_*).
• Configurable environment overrides via COMPTEXT_CONFIG_PATH and COMPTEXT_CLI_TIMEOUT.
• Error handling parses ErrorEnvelope JSON structures from both stderr and stdout streams.
• Clean separation between mocked unit tests (tests/runtime/test_cli_adapter.py) and binary integration tests (tests/runtime/test_cli_adapter_integration.py).

Tests

• 256 passing pytest tests (python -m pytest).

[gemini-code-assist]

Code Review

This pull request introduces a Python adapter (modules/runtime/cli_adapter.py) to interface with the Rust-based ctxt CLI runtime, along with corresponding integration tests. The adapter provides functions to validate agent specifications, perform dry runs, and replay/verify logged evidence. Feedback on the changes suggests improving robustness by allowing configuration of the config path and execution timeout via environment variables, parsing both stdout and stderr for JSON error envelopes on non-zero exit codes, and skipping integration tests when the compiled Rust binary is not available.

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[ProfRandom92]

@coderabbitai full review