refactor(docker): drop manual @hermes/ink build, rely on esbuild bundle

the esbuild pipeline (scripts/build.mjs) already bundles ink into a
single self-contained dist/entry.js.

remove the Dockerfile steps that manually copied packages/hermes-ink
into node_modules/@hermes/ink and ran a nested
npm install there.

- Dockerfile: simplify TUI build step to just 'npm run build'
- hermes_cli/main.py: _tui_build_needed now checks dist/entry.js
staleness against source files before falling back to the old
ink-bundle.js logic
- tests: update TUI npm install tests and drop the Dockerfile contract
test for the removed ink materialization step

tests/tools/test_dockerfile_pid1_reaping.py

@@ -121,20 +121,6 @@ def test_dockerfile_builds_tui_assets(dockerfile_text):
     )
 
 
-def test_dockerfile_materializes_local_tui_ink_package(dockerfile_text):
-    assert any(
-        "ui-tui" in step
-        and "node_modules/@hermes/ink" in step
-        and "packages/hermes-ink" in step
-        and "rm -rf packages/hermes-ink/node_modules" in step
-        and "npm install --omit=dev" in step
-        and "--prefix node_modules/@hermes/ink" in step
-        and "rm -rf node_modules/@hermes/ink/node_modules/react" in step
-        and "await import('@hermes/ink')" in step
-        for step in _run_steps(dockerfile_text)
-    )
-
-
 def test_dockerignore_excludes_nested_dependency_dirs():
     if not DOCKERIGNORE.exists():
         pytest.skip(".dockerignore not present in this checkout")