share .pql/hooks/ across clones

The pql plan auto-export (pre-commit) and auto-import (post-merge)
hooks were previously gitignored as part of `.pql/*`. Allowing the
hooks directory to be committed means a fresh clone gets the
planning-state sync without needing to run `pql init` first — pql
plan snapshots stay current on push and absorb changes on pull
the same way for every contributor.

Co-Authored-By: Claude <noreply@anthropic.com>

.pql/hooks/pre-commit

@@ -0,0 +1,11 @@
+#!/bin/sh
+# --- pql plan export ---
+# Auto-installed by pql init. Exports planning state so it's
+# committed alongside code changes. Safe no-op if pql is absent.
+if command -v pql >/dev/null 2>&1; then
+    pql plan export 2>/dev/null
+    if ! git diff --quiet -- .pql/pql-plan.json 2>/dev/null; then
+        git add .pql/pql-plan.json
+    fi
+fi
+# --- end pql ---