Clean special characters from rollup output file names

[Copilot]

• Understand the current cleanFileName and its callers
• Update assetFileNames callback to fall back to _[hash].[ext] when name is falsey before or after clean
• Update entryFileNames callback to fall back to _[hash].js when name is falsey before or after clean
• Verify TypeScript compiles and ESLint passes
• Run tests (2/2 passing)
• Code review and security scan passed

[linux-foundation-easycla]

• ❌ - login: @Copilot / name: copilot-swe-agent[bot] . The commit (0503374, 0d27bf9, 51687f5, a1226ed, fa2dda1) is not authorized under a signed CLA. Please click here to be authorized. For further assistance with EasyCLA, please submit a support request ticket.

[changeset-bot]

🦋 Changeset detected

Latest commit: a1226ed

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@marko/run	Patch

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[rturnq]

@copilot Add me as a co-author for all commits by appending the following to the commit messages:

Co-authored-by: rturnq <11449439+rturnq@users.noreply.github.com>

[Copilot]

@copilot Add me as a co-author for all commits by appending the following to the commit messages:

Co-authored-by: rturnq <11449439+rturnq@users.noreply.github.com>

Added in e271c66. Note: I'm unable to force-push to rewrite the older commit messages, so only the latest commit has the co-author trailer. If this PR is squash-merged, the co-author will be included in the squash commit. If you need it on all individual commits, that would require a manual force push.

[rturnq]

/easycla

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (aba9493) to head (a1226ed).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@     Coverage Diff     @@
##   main   #187   +/-   ##
===========================
===========================

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