✅ test: add MCP smoke-test infrastructure and initial e2e test suites

Introduce an in-process MCP test harness that boots a real server with
InMemoryTransport, injects a capturing command executor, and exposes
an MCP client for end-to-end assertions.

Includes four smoke-test suites: CLI surface (help/version/tools),
MCP discovery (listTools coverage), MCP invocation (callTool with
mocked commands), and session management (defaults round-trip).

Adds test-only reset/override hooks in command.ts, server-state.ts,
tool-registry.ts, and debugger/tool-context.ts to support singleton
teardown between test runs. Separates smoke tests from unit tests via
a dedicated vitest.smoke.config.ts and a new test:smoke npm script.

Author: cameroncooke

package.json

@@ -33,6 +33,7 @@
     "docs:update": "npx tsx scripts/update-tools-docs.ts",
     "docs:update:dry-run": "npx tsx scripts/update-tools-docs.ts --dry-run --verbose",
     "test": "vitest run",
+    "test:smoke": "vitest run --config vitest.smoke.config.ts",
     "test:watch": "vitest",
     "test:ui": "vitest --ui",
     "test:coverage": "vitest run --coverage"