feat(skill): ck — context-keeper v2, persistent per-project memory

Adds the ck (Context Keeper) skill — deterministic Node.js scripts
that give Claude Code persistent, per-project memory across sessions.

Architecture:
- commands/ — 8 Node.js scripts handle all command logic (init, save,
  resume, info, list, forget, migrate, shared). Claude calls scripts
  and displays output — no LLM interpretation of command logic.
- hooks/session-start.mjs — injects ~100 token compact summary on
  session start (not kilobytes). Detects unsaved sessions, git
  activity since last save, goal mismatch vs CLAUDE.md.
- context.json as source of truth — CONTEXT.md is generated from it.
  Full session history, session IDs, git activity per save.

Commands: /ck:init /ck:save /ck:resume /ck:info /ck:list /ck:forget /ck:migrate
Source: https://github.com/sreedhargs89/context-keeper
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

skills/ck/commands/resume.mjs

@@ -0,0 +1,41 @@
+#!/usr/bin/env node
+/**
+ * ck — Context Keeper v2
+ * resume.mjs — full project briefing
+ *
+ * Usage: node resume.mjs [name|number]
+ * stdout: bordered briefing box
+ * exit 0: success  exit 1: not found
+ */
+
+import { resolveContext, renderBriefingBox } from './shared.mjs';
+import { execSync } from 'child_process';
+
+const arg = process.argv[2];
+const cwd = process.env.PWD || process.cwd();
+
+const resolved = resolveContext(arg, cwd);
+if (!resolved) {
+  const hint = arg ? `No project matching "${arg}".` : 'This directory is not registered.';
+  console.log(`${hint} Run /ck:init to register it.`);
+  process.exit(1);
+}
+
+const { context, projectPath } = resolved;
+
+// Attempt to cd to the project path
+if (projectPath && projectPath !== cwd) {
+  try {
+    const exists = execSync(`test -d "${projectPath}" && echo yes || echo no`, {
+      stdio: 'pipe', encoding: 'utf8', timeout: 2000,
+    }).trim();
+    if (exists === 'yes') {
+      console.log(`→ cd ${projectPath}`);
+    } else {
+      console.log(`⚠  Path not found: ${projectPath}`);
+    }
+  } catch { /* non-fatal */ }
+}
+
+console.log('');
+console.log(renderBriefingBox(context));