feat(mcp): add callable docs tools

[crup]

Adds MCP tools in addition to resources so editors and agents can call docs actions directly.

Changes:

• Adds tools/list and tools/call handling to the MCP server.
• Adds get_api_docs, get_recipe, and search_docs tools.
• Extends the MCP smoke test to call the tools.
• Updates README and AI docs to list the callable MCP tools.
• Updates the MCP docs server size row after the tool additions.

On package layout:

• Keeping the executable in dist is intentional. It is generated, minified, and covered by the package build. Publishing a root-level mcp/server.js would either ship source or require generated files outside the build output.

Validation run locally:

• pnpm typecheck
• pnpm test
• pnpm build
• pnpm docs:build
• pnpm readme:check
• pnpm mcp:check
• pnpm size
• pnpm pack --dry-run
• git diff --check

Release note:

• npm latest is already 0.0.4, so this should publish as 0.0.5 after merge.

[github-actions]

Bundle size report

Entry	Files	Raw	Gzip	Brotli	Raw delta	Gzip delta	Brotli delta
core	2	4.44 kB	1.52 kB	1.40 kB	0 B	0 B	0 B
timer group add-on	3	10.93 kB	3.83 kB	3.50 kB	0 B	0 B	0 B
schedules add-on	3	8.62 kB	3.02 kB	2.78 kB	0 B	0 B	0 B
duration helper	1	318 B	224 B	192 B	0 B	0 B	0 B
diagnostics helper	1	105 B	115 B	90 B	0 B	0 B	0 B
MCP docs server	1	6.69 kB	2.60 kB	2.25 kB	+2.89 kB	+990 B	+863 B
core CJS	1	4.71 kB	1.63 kB	1.50 kB	0 B	0 B	0 B
timer group CJS	1	11.02 kB	3.86 kB	3.54 kB	0 B	0 B	0 B
schedules CJS	1	8.71 kB	3.04 kB	2.81 kB	0 B	0 B	0 B
duration CJS	1	808 B	475 B	424 B	0 B	0 B	0 B
diagnostics CJS	1	605 B	367 B	326 B	0 B	0 B	0 B