fix: show actual memory usage (exclude cache) + add build:container script

- Dashboard memory: use /proc/meminfo MemAvailable instead of os.freemem()
  to exclude Linux buffer/cache from reported usage
- Add build:container npm script for reviewer Docker image rebuild
- Update deploy commands in CLAUDE.md and README.md to include build:container

CLAUDE.md

@@ -40,6 +40,7 @@ Run commands directly—don't tell the user to run them.
 ```bash
 bun run build                              # Build main project
 bun run build:runners                      # Install + build both runners
+bun run build:container                    # Rebuild reviewer Docker image
 bun run dev                                # Dev mode with hot reload
 ```
 
@@ -52,7 +53,7 @@ journalctl --user -u ejclaw -f                    # Follow logs
 
 Deploy to server (build on server, not locally):
 ```bash
-ssh clone-ej@100.64.185.108 'cd ~/EJClaw && git pull && bun run build && bun run build:runners && systemctl --user restart ejclaw'
+ssh clone-ej@100.64.185.108 'cd ~/EJClaw && git pull && bun run build && bun run build:runners && bun run build:container && systemctl --user restart ejclaw'
 ```
 
 ## Service Stack Architecture

README.md

@@ -114,6 +114,7 @@ cd EJClaw
 bun install
 bun run build:runners
 bun run build
+bun run build:container          # Build reviewer Docker image
 ```
 
 ### Environment
@@ -157,7 +158,7 @@ MOA_GLM_API_FORMAT=anthropic
 ### Deploy
 
 ```bash
-ssh clone-ej@100.64.185.108 'cd ~/EJClaw && git pull && bun run build && bun run build:runners && systemctl --user restart ejclaw'
+ssh clone-ej@100.64.185.108 'cd ~/EJClaw && git pull && bun run build && bun run build:runners && bun run build:container && systemctl --user restart ejclaw'
 ```
 
 ## Development
@@ -165,6 +166,7 @@ ssh clone-ej@100.64.185.108 'cd ~/EJClaw && git pull && bun run build && bun run
 ```bash
 bun run build                # Build main project
 bun run build:runners        # Install + build both runners
+bun run build:container      # Rebuild reviewer Docker image
 bun run dev                  # Dev mode with hot reload
 bun test                     # Run tests
 ```

package.json

@@ -7,6 +7,7 @@
   "scripts": {
     "build": "tsc",
     "build:runners": "bun install --cwd runners/agent-runner && bun run --cwd runners/agent-runner build && bun install --cwd runners/codex-runner && bun run --cwd runners/codex-runner build",
+    "build:container": "docker build -f container/Dockerfile -t ejclaw-reviewer:latest .",
     "restart:stack": "bash scripts/restart-ejclaw-stack.sh",
     "restart:hint": "bun src/restart-context-cli.ts write",
     "start": "bun dist/index.js",

src/unified-dashboard.ts

@@ -1,4 +1,5 @@
 import { execSync } from 'child_process';
+import fs from 'fs';
 import os from 'os';
 
 import {
@@ -524,7 +525,17 @@ async function buildUsageContent(): Promise<string> {
   const cpuCount = os.cpus().length;
   const cpuPct = Math.round((loadAvg[1] / cpuCount) * 100);
   const totalMem = os.totalmem();
-  const usedMem = totalMem - os.freemem();
+  // os.freemem() includes buffers/cache as "used" — misleading.
+  // Read MemAvailable from /proc/meminfo for actual available memory.
+  let availableMem = os.freemem();
+  try {
+    const meminfo = fs.readFileSync('/proc/meminfo', 'utf-8');
+    const match = meminfo.match(/MemAvailable:\s+(\d+)\s+kB/);
+    if (match) availableMem = parseInt(match[1], 10) * 1024;
+  } catch {
+    /* non-Linux or unreadable — fall back to os.freemem() */
+  }
+  const usedMem = totalMem - availableMem;
   const memPct = Math.round((usedMem / totalMem) * 100);
   const memUsedGB = (usedMem / 1073741824).toFixed(1);
   const memTotalGB = (totalMem / 1073741824).toFixed(1);