fix(agent-core): refresh MCP tools on list changes

[Pluviobyte]

Related Issue

Resolve #1138

Problem

See linked issue. Connected MCP servers can advertise tools.listChanged, but the active session kept the startup tool registry after notifications/tools/list_changed.

What changed

• Wire SDK tool-list change callbacks into the stdio, streamable HTTP, and SSE MCP clients.
• Refresh the current connected server entry in McpConnectionManager while ignoring stale reconnect attempts and preserving existing tools on refresh errors.
• Add a dynamic stdio MCP fixture plus manager and session-level tests proving new tools become visible in the active agent.
• Add a patch changeset for the CLI and agent-core packages.

Validation:

• pnpm -C packages/agent-core exec vitest run test/mcp/connection-manager.test.ts
• pnpm --filter @moonshot-ai/agent-core run typecheck
• pnpm exec oxlint --type-aware packages/agent-core/src/mcp/client-shared.ts packages/agent-core/src/mcp/client-stdio.ts packages/agent-core/src/mcp/client-http.ts packages/agent-core/src/mcp/client-sse.ts packages/agent-core/src/mcp/connection-manager.ts packages/agent-core/test/mcp/connection-manager.test.ts packages/agent-core/test/mcp/fixtures/dynamic-tools-stdio-server.mjs
• pnpm changeset status --since main

Checklist

• I have read the CONTRIBUTING document.
• I have linked a related issue, or explained the problem above.
• I have added tests that prove my feature works.
• Ran gen-changesets skill, or this PR needs no changeset.
• Ran gen-docs skill, or this PR needs no doc update.

[changeset-bot]

🦋 Changeset detected

Latest commit: 63654b8

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@moonshot-ai/agent-core	Patch
@moonshot-ai/kimi-code	Patch

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