refactor(gitignore): add global **/dist pattern and remove redundant local gitignores

All dist/ directories are build artifacts and should be gitignored.
Add **/dist to root .gitignore alongside existing **/build, **/coverage,
and **/html patterns.

Remove redundant local .gitignore files:
- packages/cli/.gitignore (only contained dist/)
- packages/cli-with-sentry/.gitignore (only contained dist/)

All build artifacts are now consistently handled by root .gitignore:
- **/build (workspace + archive)
- **/dist (build output)
- **/coverage (test coverage)
- **/html (generated docs)

Author: jdalton

.gitignore

@@ -23,6 +23,7 @@ Thumbs.db
 **/coverage
 **/.type-coverage
 **/build
+**/dist
 **/node_modules
 .build-checkpoints
 *.d.ts
@@ -40,10 +41,8 @@ Thumbs.db
 *.sw?
 .*.sw?
 
-# Build artifacts: build/ = gitignored (workspace + archive), dist/ = tracked (blessed releases).
+# Build artifacts: All build/, dist/, coverage/, and html/ directories are gitignored.
 # Exceptions:
-#   - packages/cli/dist/ is Rollup output (ephemeral), gitignored by packages/cli/.gitignore
-#   - packages/cli-with-sentry/dist/ is esbuild output (ephemeral), gitignored by packages/cli-with-sentry/.gitignore
 #   - !/docs/build allows tracking docs/build/ (documentation directory, not build artifacts)
 #   - Note: New files in docs/build/ require `git add -f` due to **/build pattern