fix(mem0-plugin): remove noisy session-state dumps, match openclaw pattern

- Remove all background REST API transcript dumps (on_pre_compact.py,
  capture_compact_summary.py, on_pre_commit.py calls) that were creating
  noisy session_state and commit_context memories automatically
- Rewrite pre-compaction prompt to extract individual durable facts
  (decisions, learnings, anti-patterns) instead of session summary blobs
- Agent now decides what to store, matching openclaw's triage pattern:
  "Most sessions produce zero memory operations. That is correct."
- Fix auto_import.py to search git repo root for CLAUDE.md/AGENTS.md
  (was only searching plugin cwd, missing files in parent directory)
- Fix health check session tracker to check stats file directly instead
  of depending on CLAUDE_PLUGIN_ROOT env var
- Fix session-end report to print in SessionEnd hook (Stop hook output
  doesn't render on /exit)
- Update v2 API endpoint to v3 in git commit capture search
- Keep auto_import.py as only direct REST write path (project profiles,
  idempotent, hash-gated)

mem0-plugin/scripts/on_git_commit_capture.sh

@@ -28,18 +28,11 @@ esac
 
 SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
 
-if [ ! -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
 
-# Background: capture staged changes as memory
-git diff --cached --stat 2>/dev/null | python3 "$SCRIPT_DIR/on_pre_commit.py" &
-
 # Foreground: search for relevant memories about changed files
 CHANGED_FILES=$(git diff --cached --name-only 2>/dev/null | head -10 | tr '\n' ', ' | sed 's/,$//')
 if [ -z "$CHANGED_FILES" ]; then