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/add-post-commit-autopilot-driver/SPEC.md

@@ -0,0 +1,20 @@
+# SPEC: Add Post-Commit Autopilot Driver Reminder
+
+## Problem
+When autopilot is enabled, tasks can be left hanging after commits. There's no
+automated reminder to drive them to completion.
+
+## Requirements
+1. Create a post-commit hook at `scripts/git-hooks/post-commit`
+2. After a commit succeeds, check if autopilot is enabled (.agent.md)
+3. If autopilot is enabled and non-terminal tasks exist, output a summary:
+   - Number of non-terminal tasks
+   - Their current phases
+   - Clear instruction: "Run the orchestrator to drive them to completion"
+4. Exit 0 always (informational only, never blocks)
+
+## Acceptance Criteria
+- Post-commit hook exists and is executable
+- Hook output is silent when no work remains or autopilot is off
+- Hook prints actionable summary when work exists and autopilot is on
+- bash -n passes syntax check