Add Python unittest emit kit

[TSavo]

Summary

• add provekit-emit-python-unittest as a separate Python emitter artifact
• emit native unittest.TestCase tests and assertions from normalized predicates
• report unsupported predicates honestly with incomplete status
• add Rust CLI integration coverage for config/manifest/RPC dispatch only

Verification

• PYTHONDONTWRITEBYTECODE=1 PYTHONPATH=implementations/python/provekit-emit-python-unittest/src python3 -m pytest -p no:cacheprovider implementations/python/provekit-emit-python-unittest/tests -q
• PYTHONDONTWRITEBYTECODE=1 cargo test --manifest-path implementations/rust/Cargo.toml -p provekit-cli --test cmd_emit_python_unittest -- --nocapture
• cargo fmt --manifest-path implementations/rust/provekit-cli/Cargo.toml --check
• git diff --check

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

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Run ID: dd4ba35f-7723-4ecc-b015-c5dd68fe6357

📥 Commits

Reviewing files that changed from the base of the PR and between ff19472 and 41528ad.

📒 Files selected for processing (13)

• implementations/python/provekit-emit-python-unittest/README.md
• implementations/python/provekit-emit-python-unittest/pyproject.toml
• implementations/python/provekit-emit-python-unittest/src/provekit_emit_python_unittest/__init__.py
• implementations/python/provekit-emit-python-unittest/src/provekit_emit_python_unittest/__main__.py
• implementations/python/provekit-emit-python-unittest/src/provekit_emit_python_unittest/emitter.py
• implementations/python/provekit-emit-python-unittest/src/provekit_emit_python_unittest/plugin_memento.py
• implementations/python/provekit-emit-python-unittest/src/provekit_emit_python_unittest/predicate_table.py
• implementations/python/provekit-emit-python-unittest/src/provekit_emit_python_unittest/rpc.py
• implementations/python/provekit-emit-python-unittest/tests/test_emitter.py
• implementations/python/provekit-emit-python-unittest/tests/test_end_to_end.py
• implementations/python/provekit-emit-python-unittest/tests/test_predicate_table.py
• implementations/python/provekit-emit-python-unittest/tests/test_rpc.py
• implementations/rust/provekit-cli/tests/cmd_emit_python_unittest.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/python-unittest-emitter-20260529

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[chatgpt-codex-connector]

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Reviewed commit: 41528add96

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[chatgpt-codex-connector]

Normalize canonical predicate symbols

When the EmitPlan contains canonical neutral atom names such as =, <, or ≤, this returns the symbol unchanged, but _HANDLERS only contains the sugar names (eq, lt, le, etc.), so those supported predicates are reported as unsupported and the CLI exits incomplete for normal harvester output. The Rust emitter documents that the harvester emits canonical math symbols (implementations/rust/provekit-emit-rust-cargo-test/src/lib.rs:103-111), and provekit emit forwards the plan to the kit unchanged, so this unittest kit needs the same symbol-to-head normalization before lookup.

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