Changesets core release flow

[0xKoller]

Adds Changesets-based release management for the core packages (xmcp, create-xmcp-app, and init-xmcp).

• Adds Changesets config, scripts, and GitHub workflow.
• Automates Version Packages PR creation on main.
• Publishes core packages to npm automatically after the Version Packages PR is merged.
• Removes the old GitHub Release-based npm publish workflow to avoid duplicate publish paths.
• Marks examples as private so they are never treated as publishable workspace packages.
• Documents the new release flow in CONTRIBUTING.md, AGENTS.md, and CLAUDE.md.

Plugins and @xmcp-dev/cli remain on their existing manual publish workflows.

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Project	Deployment	Actions	Updated (UTC)
xmcp-website	Ready	Preview, Comment	May 20, 2026 6:11pm

[github-actions]

Rspack Bundle Analysis

Build	Assets	Total Size (MB)	Build Time
Main Compiler	5	6.30	5.23s
Runtime Compiler	7	5.34	5.71s

Main Compiler

Source: stats-main.json

Asset	Chunk	Size (KB)	Size (MB)
cli.js	cli	5975.45	5.84
index.js	index	374.78	0.37
cloudflare.js	cloudflare	81.70	0.08
detached-flush.js	detached-flush	15.18	0.01
host-bridge.js	host-bridge	4.76	0.00

Total emitted JS: 6.30 MB

Runtime Compiler

Source: stats-runtime.json

Asset	Chunk	Size (KB)	Size (MB)
http.js	http	1044.83	1.02
adapter-nestjs.js	adapter-nestjs	1021.04	1.00
adapter-nextjs.js	adapter-nextjs	1015.59	0.99
adapter-express.js	adapter-express	1013.35	0.99
adapter-fastify.js	adapter-fastify	1013.24	0.99
stdio.js	stdio	354.98	0.35
headers.js	headers	1.73	0.00

Total emitted JS: 5.34 MB

Package Footprint (npm pack + npm install)

Item	Size (KB)	Size (MB)
Tarball (.tgz)	4098.14	4.00
dist/	11999.93	11.72
node_modules/	101791.11	99.41
dist + node_modules	113791.04	111.12