docs(examples): index missing server and client examples in README

[GopalGB]

Summary

Several runnable example files exist in examples/server/src/ and examples/client/src/ but are not listed in the example index tables in their respective README.md files. Users browsing the example READMEs cannot discover them without scanning the directories directly.

This PR adds one row per missing example to the existing tables. No code changes.

Why

The README example index is the canonical entry point. Examples that are not listed effectively don't exist for new users — every other example has a row, and the missing ones cover commonly requested scenarios (custom schema validators, custom protocol versions, simple bearer auth).

Changes

examples/server/README.md

Added rows for:

• src/arktypeExample.ts — ArkType / Standard Schema input validation
• src/valibotExample.ts — Valibot + @valibot/to-json-schema validation
• src/customProtocolVersion.ts — supporting protocol versions not yet in the SDK

examples/client/README.md

Added rows for:

• src/simpleTokenProvider.ts — minimal AuthProvider for pre-configured tokens
• src/dualModeAuth.ts — same authProvider option for host-managed and OAuth flows
• src/customMethodExample.ts — vendor-prefixed (acme/search) custom method client

Excluded

Files that are intentionally not standalone runnable examples are not added:

• serverGuide.examples.ts / clientGuide.examples.ts — snippet sources synced into docs/
• inMemoryEventStore.ts — supporting module imported by the streamable HTTP examples
• customMethodExample.ts (server side) — spawned by the client example via stdio

How to test

• View examples/server/README.md and examples/client/README.md and confirm the new rows render as part of the existing tables.
• Confirm all relative links in the new rows resolve to existing files.

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Latest commit: c36781b

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commit: c36781b

[GopalGB]

Closing this on reflection — too lightweight (drive-by docs/typo). Will follow up with a substantive code fix in a separate PR. Apologies for the noise.