refactor: consolidate Claude/Codex MCP runtime

[benvinegar]

Summary

• consolidate shared Claude/Codex MCP runtime logic into common/mcp/glance-mcp.js
• replace duplicated plugin server implementations with small wrappers
• add sync tooling so package-local copies stay aligned with the shared source

What changed

Shared runtime source

• added common/mcp/glance-mcp.js
  • exports createGlanceRuntime
  • exports createMcpServer
  • exports isMainModule(importMetaUrl, argvPath?)

Claude/Codex wrappers

• claude/servers/glance-mcp.js now imports shared runtime and only handles process bootstrap
• codex/servers/glance-mcp.js now imports shared runtime, keeps createCodexMcpServer, and keeps executable entrypoint behavior

Package-local synced copies

To keep standalone package publishing/install behavior intact, synced copies now exist at:

• claude/common/mcp/glance-mcp.js
• codex/common/mcp/glance-mcp.js

Sync/check tooling

• added scripts/sync-mcp-common.mjs
• root scripts:
  • npm run sync:mcp-common
  • npm run check:mcp-common
• test and test:coverage now run sync-check first

Packaging updates

• claude/package.json now includes common/mcp/glance-mcp.js in published files
• codex/package.json now includes common/mcp/glance-mcp.js in published files

Validation

• npm test
• npm run test:coverage
• npm exec -- tsc --noEmit
• npm pack --dry-run in codex/ and claude/
• local codex tarball smoke check (npx -p <tarball> glance-codex) stays running for MCP handshake