Add integration tests in sandboxed environment (#73)

[titouanmathis]

Closes #73

What

End-to-end integration tests that exercise the real CLI binary and real MCP server in a sandboxed environment with a mock Productive.io API — no real API calls.

Implementation

Infrastructure

• tests/integration/helpers/mock-server.ts — lightweight http.createServer app serving canned JSON:API fixtures. Validates X-Auth-Token + X-Organization-Id headers. Per-test error overrides via setError().
• tests/integration/helpers/sandbox.ts — creates a temp dir tree (home/, config/, cache/). Builds a locked-down child process env — NO ...process.env spread. Credentials injected via env vars to short-circuit keychain.
• tests/integration/helpers/cli-runner.ts — spawns the real packages/cli/dist/cli.js binary in the sandbox via node:child_process.execFile.
• tests/integration/helpers/mcp-client.ts — wraps @modelcontextprotocol/sdk's StdioClientTransport + Client for stdio tests; raw fetch for HTTP tests.

Fixtures

Static JSON:API files in tests/integration/fixtures/:

• projects-list.json, projects-get.json
• tasks-list.json
• time-entries-list.json
• people-list.json

Tests (33 total, ~4s)

File	Tests	What
cli/help.test.ts	5	--help, subcommand help
cli/config.test.ts	4	config get/set/validate
cli/projects.test.ts	8	list/get, JSON format, aliases, 401/500 errors
cli/time.test.ts	4	list, JSON format, alias, 401 error
mcp/stdio.test.ts	6	listTools, listPrompts, callTool (projects + time), error resource
mcp/http.test.ts	6	health, initialize, tools/list, tools/call, 401, unknown method

Also

• packages/mcp/src/handlers/index.ts — added baseUrl: process.env.PRODUCTIVE_BASE_URL to ProductiveApi config in executeToolWithCredentials (HTTP transport was missing this, stdio already worked via getConfig())
• package.json — added test:integration, test:integration:watch, test:all scripts
• .github/workflows/ci.yml — added integration-test job (needs build artifacts, runs after build, included in ci-pass)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.75%. Comparing base (5330128) to head (090b486).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #78   +/-   ##
=======================================
  Coverage   93.75%   93.75%           
=======================================
  Files         197      197           
  Lines        6723     6723           
  Branches     2182     2215   +33     
=======================================
  Hits         6303     6303           
  Misses        415      415           
  Partials        5        5           

Flag	Coverage Δ
unittests	93.75% <ø> (ø)

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