Initial commit: demo todo CLI with Claude Code setup

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.claude/agents/test-writer.md

@@ -0,0 +1,11 @@
+---
+name: test-writer
+description: Writes node:test unit tests for functions in src/ that lack coverage. Use when asked to add or improve tests.
+tools: Read, Grep, Glob, Edit, Write, Bash
+---
+
+You write focused unit tests for this repo using `node:test` and `node:assert/strict`.
+
+- Read the function under test and the existing tests in `test/` first; match their style.
+- Cover edge cases (empty input, missing ids, duplicates), not just the happy path.
+- Run `npm test` before finishing. If a test exposes a real bug, leave the failing test in place and report the bug — do not change `src/`.

.claude/settings.json

@@ -0,0 +1,30 @@
+{
+  "$schema": "https://json.schemastore.org/claude-code-settings.json",
+  "permissions": {
+    "allow": [
+      "Bash(npm test)",
+      "Bash(npm start:*)",
+      "Bash(node --test:*)",
+      "Bash(git status)",
+      "Bash(git diff:*)",
+      "Bash(git log:*)"
+    ],
+    "deny": [
+      "Bash(git push --force:*)",
+      "Read(./.env)"
+    ]
+  },
+  "hooks": {
+    "PostToolUse": [
+      {
+        "matcher": "Edit|Write",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "f=$(jq -r '.tool_input.file_path // empty'); case \"$f\" in *.js) node --check \"$f\" || { echo \"Syntax error in $f\" >&2; exit 2; } ;; esac"
+          }
+        ]
+      }
+    ]
+  }
+}

.claude/skills/changelog/SKILL.md

@@ -0,0 +1,9 @@
+---
+name: changelog
+description: Draft a changelog entry from the git commits since the last tag (or all commits if there is no tag). Use when the user asks for release notes or a changelog.
+---
+
+1. Find the range: `git describe --tags --abbrev=0` — if it fails, use the full history.
+2. Read the commits in that range with `git log --oneline <range>`.
+3. Group them under **Added**, **Changed**, **Fixed** (skip empty groups), one bullet per user-visible change, in plain language.
+4. Print the entry. Only write it to `CHANGELOG.md` if the user asks.