fix(mcp): handle client notifications

[crup]

Hardens the MCP server for stricter clients that send initialization notifications before tools/list.

Changes:

• Ignores notifications/* instead of replying with no-id JSON-RPC errors.
• Adds ping handling.
• Returns -32600 for id-bearing requests missing method.
• Adds MCP tool titles for get_api_docs, get_recipe, and search_docs.
• Updates README, AI docs, and llms-full with tool titles/descriptions.
• Extends the MCP smoke test to send notifications/initialized before tools/list.

Why:

• The reported editor error was: failed to get tools: calling tools/list: invalid request.
• The likely cause was the server replying to notifications/initialized as an unknown method with no id, which can make strict clients mark the session invalid before tools/list completes.

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 0.0.5, so this should publish as 0.0.6 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	6.95 kB	2.72 kB	2.36 kB	+268 B	+123 B	+112 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