refactor(auto-recall): accept parsed hook input directly

[wustwyh]

Remove the stdout-mocking hack in hook-handlers.ts by introducing autoRecallFromInput(input: HookInput). The CLI entry autoRecall() now reads STDIN and delegates to autoRecallFromInput, which returns the hook output JSON (or null). This makes the handler testable without intercepting process.stdout and keeps the existing CLI behavior backward-compatible.

Subsequent commits further reduce duplication:

• Extract parseHookInput() to normalize tool_name / tool_input / tool_output / session_id across STDIN conventions; returns null for unidentified payloads.
• Extract deriveSessionId() into src/utils/session-id.ts with optional includeCwd fallback.
• Adopt the shared helpers in autoRecallHandler, todowrite-hint, dashboard-collector, and contribute-check.
• Expand unit tests for parseHookInput, autoRecallFromInput edge cases, WebSearch/WebFetch recall, dedup/rate-limit, and deriveSessionId.

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature causing existing behavior to change)
• Documentation only
• Refactor / internal cleanup

Test Plan

px tsc --noEmit passes

px vitest run src/tests/auto-recall.test.ts src/tests/hook-handlers.test.ts src/tests/session-id.test.ts src/tests/dashboard-collector.test.ts src/tests/todowrite-hint.test.ts src/tests/contribute-check.test.ts src/tests/contribute-check-phase2.test.ts src/tests/auto-recall-quality.test.ts passes

• Added/updated tests for the change

Related Issues

N/A

Notes for Reviewers

The PR keeps existing behavior unchanged:

• autoRecall() remains the STDIN-based CLI entry point.
• The PID+cwd composite fallback in dashboard-collector and contribute-check is preserved via deriveSessionId({ includeCwd: true }).
• The contribute-check handler still requires an explicit session_id before running.