chore: bump all packages to 0.0.1-alpha.2

- Bumps all @mosaic/* packages from alpha.1 to alpha.2
- Excludes test/spec files from CLI build output (tsconfig fix)
- Triggers CI publish to Gitea npm registry with latest changes:
  - @mosaic/types: new AbortPayload type
  - @mosaic/mosaic: update-checker module
  - @mosaic/cli: web search, file edit, MCP mgmt, file refs, /stop

packages/cli/tsconfig.build.json

@@ -0,0 +1,4 @@
+{
+  "extends": "./tsconfig.json",
+  "exclude": ["node_modules", "dist", "src/**/*.test.ts", "src/**/*.spec.ts"]
+}