fix(mem0-plugin): wire pre-commit capture hook, add Setup hook, fix access counters

- Add PreToolUse(Bash) hook: detects `git commit` commands, fires
  on_pre_commit.py in background to capture staged changes as memory
- Add Setup(init|maintenance) hook: installs mem0ai SDK on first plugin
  install via ensure_deps.sh (120s timeout for slow networks)
- Add on_git_commit_capture.sh wrapper: reads tool input JSON, matches
  git commit/merge/rebase, runs capture script fire-and-forget
- Fix #24: add metadata.last_accessed ISO timestamp to access counter
  instructions in mem0-mcp/SKILL.md alongside existing access_count

mem0-plugin/scripts/on_git_commit_capture.sh

@@ -0,0 +1,41 @@
+#!/usr/bin/env bash
+# Hook: PreToolUse (matcher: Bash)
+#
+# Detects `git commit` commands and fires on_pre_commit.py in the background
+# to capture staged changes as a mem0 memory. Never blocks the commit.
+#
+# Input:  JSON on stdin with tool_name, tool_input
+# Output: none (always exit 0)
+
+set -euo pipefail
+
+INPUT=$(cat)
+
+COMMAND=$(echo "$INPUT" | jq -r '.tool_input.command // ""' 2>/dev/null || echo "")
+
+if [ -z "$COMMAND" ]; then
+  exit 0
+fi
+
+case "$COMMAND" in
+  *"git commit"*|*"git merge"*|*"git rebase"*)
+    ;;
+  *)
+    exit 0
+    ;;
+esac
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+
+if [ ! -x "$SCRIPT_DIR/on_pre_commit.py" ] && [ ! -f "$SCRIPT_DIR/on_pre_commit.py" ]; then
+  exit 0
+fi
+
+API_KEY="${MEM0_API_KEY:-${CLAUDE_PLUGIN_OPTION_MEM0_API_KEY:-}}"
+if [ -z "$API_KEY" ]; then
+  exit 0
+fi
+
+git diff --cached --stat 2>/dev/null | python3 "$SCRIPT_DIR/on_pre_commit.py" &
+
+exit 0