feat(release): publish package source, declaration maps, and documentation

Every release member publishes its TypeScript source and the declaration
maps that resolve into it, and @deepseek-ai/dsh publishes the repository
Markdown documentation staged from docs/ at prepack time.

The ./src/* export most members already declared now resolves for an
installed consumer, and a consumer editor follows a declaration to the
implementation. Bundled JavaScript maps stay unpublished; the vendored
family and the Desktop runtime file policy are unchanged.

Rationale: .agents/notes/implemented/process/2026-10-08-published-source-and-docs.md

packages/experimental/ptc-runtime-python/package.json

@@ -20,7 +20,9 @@
   "files": [
     "lib/index.js",
     "py/**/*.py",
-    "lib/types/**/*.d.ts"
+    "lib/types/**/*.d.ts",
+    "lib/types/**/*.d.ts.map",
+    "src"
   ],
   "license": "MIT",
   "peerDependencies": {