chore: recover 0.64.2 release publishing (#945)

Release-please cannot process the already-merged, untagged release PR
#943.

This adds an explicit workflow dispatch path for publishing a supplied
tag or commit while preserving the normal push-driven release flow, and
restores the 0.64.2 release metadata for the recovery tag.

After merge, I will create `v0.64.2` at this commit and dispatch the
publish workflow for that tag.

Validation:
- ESLint
- Prettier
- TypeScript build
- Vitest: 684 passed, 20 skipped

.release-please-manifest.json

@@ -1,3 +1,3 @@
 {
-  ".": "0.64.1"
+  ".": "0.64.2"
 }