Add read-only WebMCP discovery tools

[ashryanbeats]

Summary

• adds seven read-only WebMCP tools for meetup and published member-content discovery
• reuses the existing normalized event/feed snapshots rather than creating a second data source
• supports the current document.modelContext.registerTool() API and the earlier navigator.modelContext.provideContext() shape
• feature-detects WebMCP so unsupported browsers have no visible change or errors
• bounds inputs, validates URLs, marks remote event/feed output as untrusted, and performs no external side effects

Tools

• get_next_meetup
• list_upcoming_meetups
• get_event_details
• get_community_links
• list_member_posts
• get_member_post
• search_member_posts

Verification

• npm run check
• npx astro build
• 122 tests passing
• generated page embeds minimal event data and curated member posts
• browser registration tests cover modern, legacy, and unsupported WebMCP environments

Scope

This PR is read-only. It does not submit RSVPs, publish content, edit GitHub, send messages, or navigate external sites automatically.

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