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/init.mjs

@@ -0,0 +1,143 @@
+#!/usr/bin/env node
+/**
+ * ck — Context Keeper v2
+ * init.mjs — auto-detect project info and output JSON for Claude to confirm
+ *
+ * Usage: node init.mjs
+ * stdout: JSON with auto-detected project info
+ * exit 0: success  exit 1: error
+ */
+
+import { readFileSync, existsSync } from 'fs';
+import { resolve } from 'path';
+import { readProjects } from './shared.mjs';
+
+const cwd = process.env.PWD || process.cwd();
+const projects = readProjects();
+
+const output = {
+  path: cwd,
+  name: null,
+  description: null,
+  stack: [],
+  goal: null,
+  constraints: [],
+  repo: null,
+  alreadyRegistered: !!projects[cwd],
+};
+
+function readFile(filename) {
+  const p = resolve(cwd, filename);
+  if (!existsSync(p)) return null;
+  try { return readFileSync(p, 'utf8'); } catch { return null; }
+}
+
+function extractSection(md, heading) {
+  const re = new RegExp(`## ${heading}\\n([\\s\\S]*?)(?=\\n## |$)`);
+  const m = md.match(re);
+  return m ? m[1].trim() : null;
+}
+
+// ── package.json ──────────────────────────────────────────────────────────────
+const pkg = readFile('package.json');
+if (pkg) {
+  try {
+    const parsed = JSON.parse(pkg);
+    if (parsed.name && !output.name) output.name = parsed.name;
+    if (parsed.description && !output.description) output.description = parsed.description;
+
+    // Detect stack from dependencies
+    const deps = Object.keys({ ...(parsed.dependencies || {}), ...(parsed.devDependencies || {}) });
+    const stackMap = {
+      next: 'Next.js', react: 'React', vue: 'Vue', svelte: 'Svelte', astro: 'Astro',
+      express: 'Express', fastify: 'Fastify', hono: 'Hono', nestjs: 'NestJS',
+      typescript: 'TypeScript', prisma: 'Prisma', drizzle: 'Drizzle',
+      '@neondatabase/serverless': 'Neon', '@upstash/redis': 'Upstash Redis',
+      '@clerk/nextjs': 'Clerk', stripe: 'Stripe', tailwindcss: 'Tailwind CSS',
+    };
+    for (const [dep, label] of Object.entries(stackMap)) {
+      if (deps.includes(dep) && !output.stack.includes(label)) {
+        output.stack.push(label);
+      }
+    }
+    if (deps.includes('typescript') || existsSync(resolve(cwd, 'tsconfig.json'))) {
+      if (!output.stack.includes('TypeScript')) output.stack.push('TypeScript');
+    }
+  } catch { /* malformed package.json */ }
+}
+
+// ── go.mod ────────────────────────────────────────────────────────────────────
+const goMod = readFile('go.mod');
+if (goMod) {
+  if (!output.stack.includes('Go')) output.stack.push('Go');
+  const modName = goMod.match(/^module\s+(\S+)/m)?.[1];
+  if (modName && !output.name) output.name = modName.split('/').pop();
+}
+
+// ── Cargo.toml ────────────────────────────────────────────────────────────────
+const cargo = readFile('Cargo.toml');
+if (cargo) {
+  if (!output.stack.includes('Rust')) output.stack.push('Rust');
+  const crateName = cargo.match(/^name\s*=\s*"(.+?)"/m)?.[1];
+  if (crateName && !output.name) output.name = crateName;
+}
+
+// ── pyproject.toml ────────────────────────────────────────────────────────────
+const pyproject = readFile('pyproject.toml');
+if (pyproject) {
+  if (!output.stack.includes('Python')) output.stack.push('Python');
+  const pyName = pyproject.match(/^name\s*=\s*"(.+?)"/m)?.[1];
+  if (pyName && !output.name) output.name = pyName;
+}
+
+// ── .git/config (repo URL) ────────────────────────────────────────────────────
+const gitConfig = readFile('.git/config');
+if (gitConfig) {
+  const repoMatch = gitConfig.match(/url\s*=\s*(.+)/);
+  if (repoMatch) output.repo = repoMatch[1].trim();
+}
+
+// ── CLAUDE.md ─────────────────────────────────────────────────────────────────
+const claudeMd = readFile('CLAUDE.md');
+if (claudeMd) {
+  const goal = extractSection(claudeMd, 'Current Goal');
+  if (goal && !output.goal) output.goal = goal.split('\n')[0].trim();
+
+  const doNot = extractSection(claudeMd, 'Do Not Do');
+  if (doNot) {
+    const bullets = doNot.split('\n')
+      .filter(l => /^[-*]\s+/.test(l))
+      .map(l => l.replace(/^[-*]\s+/, '').trim());
+    output.constraints = bullets;
+  }
+
+  const stack = extractSection(claudeMd, 'Tech Stack');
+  if (stack && output.stack.length === 0) {
+    output.stack = stack.split(/[,\n]/).map(s => s.replace(/^[-*]\s+/, '').trim()).filter(Boolean);
+  }
+
+  // Description from first section or "What This Is"
+  const whatItIs = extractSection(claudeMd, 'What This Is') || extractSection(claudeMd, 'About');
+  if (whatItIs && !output.description) output.description = whatItIs.split('\n')[0].trim();
+}
+
+// ── README.md (description fallback) ─────────────────────────────────────────
+const readme = readFile('README.md');
+if (readme && !output.description) {
+  // First non-header, non-badge, non-empty paragraph
+  const lines = readme.split('\n');
+  for (const line of lines) {
+    const trimmed = line.trim();
+    if (trimmed && !trimmed.startsWith('#') && !trimmed.startsWith('!') && !trimmed.startsWith('>') && !trimmed.startsWith('[') && trimmed !== '---' && trimmed !== '___') {
+      output.description = trimmed.slice(0, 120);
+      break;
+    }
+  }
+}
+
+// ── Name fallback: directory name ─────────────────────────────────────────────
+if (!output.name) {
+  output.name = cwd.split('/').pop().toLowerCase().replace(/\s+/g, '-');
+}
+
+console.log(JSON.stringify(output, null, 2));