Add Tharga.Communication.Mcp package

[poxet]

Summary

New sibling package Tharga.Communication.Mcp exposing Communication runtime data via MCP (Model Context Protocol) — fulfills the pending request from Neurolito and Eplicta Core.

Resources (System scope, read-only)

URI	Description
communication://clients	Connected SignalR clients with metadata
communication://subscriptions	Active server subscriptions and counts
communication://handlers	Registered post and send message handlers

Required additive APIs in Tharga.Communication

• ClientStateServiceBase.GetConnectionInfosAsync() — non-generic enumeration of connected clients
• IHandlerTypeService.GetAll() — enumeration of registered handlers

Both are additive — no breaking changes.

Skipped from original request

• send message tool — deferred for safety; LLM-driven sends could trigger unintended handlers
• list dead letters tool — Communication is SignalR-only with no message persistence

Pipeline

GHA workflow updated to pack both packages on the same version (next: 0.1.5).

Usage

builder.AddThargaMcp(mcp => mcp.AddCommunication());
app.UseThargaMcp();

Test plan

• Build clean (0 warnings)
• All 115 tests pass (6 new for the MCP provider, plus tests for the new enumeration APIs)
• Pack succeeds locally for both packages
• Verify GHA pipeline runs green on this PR
• Verify both prerelease NuGet packages get published

[codecov]

Codecov Report

❌ Patch coverage is 97.84946% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...ga.Communication.Mcp/ThargaMcpBuilderExtensions.cs	0.00%	2 Missing ⚠️

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[github-actions]

Released as v0.1.5 — https://github.com/Tharga/Communication/releases/tag/0.1.5