feat(p1): IntentExtractor port+adapter with tests

[KooshaPari]

Summary

Implements the P1 IntentExtractor port and adapter for SessionLedger. Parses a session's messages and extracts the user's intent (goal, acceptance signals, constraints) into a structured Intent struct.

Changes

• src/domain/intent.rs — Added Intent struct with goal, acceptance_signals, constraints, user_turn_count fields alongside existing IntentState FSM
• src/ports/mod.rs — Added IntentExtractor trait (port boundary) with fn extract(&self, &Session) -> Result<Intent, PortError>
• src/distill/extractor.rs — HeuristicIntentExtractor adapter using lightweight string matching for goal, acceptance signals, and constraint extraction
• src/distill/mod.rs — Wired extractor into distill::compile, replacing the simple latest_user_request with structured intent data in the Intent bundle
• src/lib.rs — Re-exported Intent in public API

Gates

• cargo build — 0 errors
• cargo test — 11 passed, 0 failed (6 new unit tests + 5 existing integration tests)
• cargo clippy --all-targets -- -D warnings — clean
• cargo fmt --check — clean

Closes the prior compile errors from v2 (bool vs () type mismatches) by ensuring all trait method signatures are correct.

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📥 Commits

Reviewing files that changed from the base of the PR and between 902185b and 1333c6a.

📒 Files selected for processing (5)

• src/distill/extractor.rs
• src/distill/mod.rs
• src/domain/intent.rs
• src/lib.rs
• src/ports/mod.rs

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