Add autopilot-aware pre-commit warnings + post-commit driver reminder

- Pre-commit hook: warns when autopilot is enabled and non-terminal tasks exist
- Post-commit hook: after commit, prints non-terminal task summary if autopilot on
- Post-commit exits 0 always (informational only, never blocks)
- Both hooks read .agent.md to detect Autopilot: Enabled

tasks/upgrade-pre-commit-autopilot-check/SPEC.md

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+# SPEC: Upgrade Pre-Commit Hook with Autopilot Awareness
+
+## Problem
+Agents create throwaway tasks (skip to implement, commit, abandon) to bypass the pre-commit hook.
+The hook checks for an edit-phase task but doesn't detect hollow/stale tasks or warn about
+hanging tasks when autopilot is enabled.
+
+## Requirements
+1. After a successful pre-commit check, read `.agent.md` to detect `Autopilot: Enabled`
+2. If autopilot is enabled, scan all tasks for non-terminal (stuck) tasks
+3. If hanging tasks exist, emit a clear warning in the hook output
+4. Do NOT block the commit — only warn. Blocking would prevent legitimate fixes.
+5. Detect hollow tasks: tasks in implement/doc_review phase with no IMPLEMENTATION.md artifact
+
+## Acceptance Criteria
+- Pre-commit hook warns when autopilot is on and non-terminal tasks exist
+- Pre-commit hook warns when the edit task is hollow (no real implementation)
+- Existing blocking behavior (no edit task = DENIED) is preserved unchanged