v0.18.1

Fixes Neo memory feedback replay and durable API key storage.\n\n- Adds neo memory replay-feedback for current-project and cross-project linked feedback reprocessing.\n- Updates linked outcome handling so accepted/unverified/modified feedback affects fact effectiveness.\n- Normalizes suggestion paths and prevents duplicate legacy session replay.\n- Stores API keys durably in macOS Keychain instead of plaintext config by default.\n- Excludes papers/ PDFs and local coverage data from source distributions.\n\nVerification: 780 passed, 4 skipped; twine check passed for sdist and wheel.