fix(code-runtime-python): finish the experimental move — invariant name and tsconfig aliases

The move broke two generated/derived surfaces: (1) the package invariant
companion still registered the old name
@deepseek-ai/dsh-code-runtime-python, so the exhaustive-topology test found
the new name unreserved — it now registers
@deepseek-ai/dsh-experimental-code-runtime-python; (2) the tsconfig.base.json
alias for the renamed package sat inside the generated region, so
gen-tsconfig-paths dropped it (a package named after something other than its
directory needs a hand-written alias before the BEGIN marker) — the alias is
moved out and the config is current again.

packages/experimental/code-runtime-python/src/invariant.ts

@@ -1,13 +1,13 @@
 /**
- * Package-owned invariant companion for `@deepseek-ai/dsh-code-runtime-python`.
- * @module @deepseek-ai/dsh-code-runtime-python/invariant
+ * Package-owned invariant companion for `@deepseek-ai/dsh-experimental-code-runtime-python`.
+ * @module @deepseek-ai/dsh-experimental-code-runtime-python/invariant
  */
 
 /* jscpd:ignore-start */
 import type { Context } from '@deepseek-ai/cordis'
 import type { InvariantInstaller } from '@deepseek-ai/dsh-invariants'
 
-const PACKAGE_NAME = '@deepseek-ai/dsh-code-runtime-python'
+const PACKAGE_NAME = '@deepseek-ai/dsh-experimental-code-runtime-python'
 
 /** Cordis companion plugin name. */
 export const name = 'code-runtime-python-invariant'