fix(ts-plugins): prune inlined WebGL constant imports

[ibgreen]

Supports visgl/luma.gl#2852.

Goals

• Remove WebGL constant imports after every runtime use of a binding has been inlined.
• Preserve imports that still have direct, dynamic, or other live runtime uses.
• Avoid leaving type-only neighbors in generated JavaScript when an import declaration is updated.

Changes

• Tracks runtime identifier uses after replacing static GL.* and gl.* accesses.
• Prunes dead bindings from known luma.gl constant-module imports, removing the declaration when no runtime bindings remain.
• Ignores type nodes so enum-member return types and explicit type imports do not keep runtime imports alive.
• Adds coverage for full removal, mixed imports, dynamic access, direct access, and mixed enum/type annotations.

Verification

• corepack yarn@1.22.19 lint — passed (187 existing warnings, 0 errors; Prettier and lockfile checks passed)
• corepack yarn@1.22.19 build — passed
• Focused transformer tests — 8 passed
• corepack yarn@1.22.19 test — 34 passed
• Push hook — changed-file lint and all 34 Node tests passed
• luma.gl integration — full yarn build passed with this transformer; normal WebGL modules no longer emit constant imports, while the deliberate GL as GLEnum debug import remains.
• On luma.gl's WebGL debug-split branch, generated @luma.gl/webgl CommonJS root size changed from 268.8 KB to 266.6 KB.

Notes

The first commit attempt hit the repository's unpinned Corepack default and invoked Yarn 4 against a Yarn 1 lockfile. The commit was created with --no-verify only after the pinned Yarn 1 lint/build/test gates passed; the push hook subsequently ran successfully.