Remove the TS analyzer and tree-sitter from the required install path

[bbopen]

The TypeScript-side Python analyzer should be fully removed in the 0.4.x line so the supported Tywrap install and generate path standardizes on tywrap_ir and no longer depends on native tree-sitter builds. This work should also tighten the supported Node story, including reliable installation on Node 25.

Acceptance Criteria

• the TypeScript-side analyzer and its tree-sitter parser path are fully removed rather than left as a parallel supported implementation
• tree-sitter, tree-sitter-python, and any unused parser-only dependencies are no longer required for the normal npm install tywrap path
• Tywrap generation and docs clearly treat tywrap_ir as the single supported analysis source of truth
• package validation includes a fresh-install smoke path that catches Node 25 install regressions before release