workstation: provision homelab-memory hooks for all users (retire claude-memory MCP)

Roll the wizard MCP->homelab-CLI memory migration out to every devvm user. Adds
install_memory() to t3-provision-users.sh (mirrors install_playwright: per-user,
idempotent, if-absent, as-the-user): installs the 4 memory hook scripts into
~/.claude/hooks, wires them into settings.json additively (wire-memory-hooks.py
never touches env / the per-user MEMORY_API_KEY), and removes ONLY the
claude_memory MCP + plugin if present. Reuses each user's existing key (no
minting; per-user isolation stays deferred per the 2026-06-07 design). The
homelab CLI hits the same remote HTTP API the MCP used; recall runs via the
homelab-memory-recall.py UserPromptSubmit hook. Shared instructions (rules/skills
symlinked from base; root+infra CLAUDE.md) already cover all users.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

scripts/workstation/claude-hooks/pre-compact-backup.sh

@@ -0,0 +1,43 @@
+#!/bin/bash
+# PreCompact hook: Save key memories before compaction
+set -e
+
+INPUT=$(cat)
+SESSION_ID=$(echo "$INPUT" | jq -r '.session_id // .sessionId // "unknown"')
+
+MEMORY_HOME="${MEMORY_HOME:-$HOME/.claude/claude-memory}"
+MARKER_DIR="${MEMORY_HOME}/state/compaction-markers"
+MEMORY_DB="${MEMORY_HOME}/memory/memory.db"
+MARKER_FILE="${MARKER_DIR}/${SESSION_ID}.json"
+
+mkdir -p "$MARKER_DIR"
+
+TIMESTAMP=$(date -u +"%Y-%m-%dT%H:%M:%SZ")
+
+# Try API first, fall back to SQLite
+REMEMBERED_FACTS="[]"
+if [ -n "${MEMORY_API_KEY:-${CLAUDE_MEMORY_API_KEY:-}}" ]; then
+    API_KEY="${MEMORY_API_KEY:-${CLAUDE_MEMORY_API_KEY:-}}"
+    API_URL="${MEMORY_API_URL:-${CLAUDE_MEMORY_API_URL:-}}"
+    if [ -n "$API_URL" ]; then
+        REMEMBERED_FACTS=$(curl -sf -H "Authorization: Bearer ${API_KEY}" \
+            "${API_URL}/api/memories?limit=20" 2>/dev/null | \
+            jq '[.memories[] | {content, category, importance}]' 2>/dev/null || echo "[]")
+    fi
+elif [ -f "$MEMORY_DB" ]; then
+    REMEMBERED_FACTS=$(sqlite3 -json "$MEMORY_DB" \
+        "SELECT content, category, importance FROM memories ORDER BY importance DESC, created_at DESC LIMIT 20" 2>/dev/null || echo "[]")
+fi
+
+if ! echo "$REMEMBERED_FACTS" | jq empty 2>/dev/null; then
+    REMEMBERED_FACTS="[]"
+fi
+
+jq -n \
+  --arg sid "$SESSION_ID" \
+  --arg ts "$TIMESTAMP" \
+  --argjson facts "$REMEMBERED_FACTS" \
+  '{sessionId: $sid, compactedAt: $ts, rememberedFacts: $facts}' \
+  > "$MARKER_FILE"
+
+exit 0