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/list.mjs

@@ -0,0 +1,41 @@
+#!/usr/bin/env node
+/**
+ * ck — Context Keeper v2
+ * list.mjs — portfolio view of all registered projects
+ *
+ * Usage: node list.mjs
+ * stdout: ASCII table of all projects + prompt to resume
+ * exit 0: success  exit 1: no projects
+ */
+
+import { readProjects, loadContext, today, CONTEXTS_DIR } from './shared.mjs';
+import { renderListTable } from './shared.mjs';
+
+const cwd = process.env.PWD || process.cwd();
+const projects = readProjects();
+const entries = Object.entries(projects);
+
+if (entries.length === 0) {
+  console.log('No projects registered. Run /ck:init to get started.');
+  process.exit(1);
+}
+
+// Build enriched list sorted alphabetically by contextDir
+const enriched = entries
+  .map(([path, info]) => {
+    const context = loadContext(info.contextDir);
+    return {
+      name: info.name,
+      contextDir: info.contextDir,
+      path,
+      context,
+      lastUpdated: info.lastUpdated,
+    };
+  })
+  .sort((a, b) => a.contextDir.localeCompare(b.contextDir));
+
+const table = renderListTable(enriched, cwd, today());
+console.log('');
+console.log(table);
+console.log('');
+console.log('Resume which? (number or name)');