[WIP] Fix ESM script registration by name and subclass name collision

[Copilot]

Thanks for the feedback on #8831. I've created this new PR, which merges into #8831, to address your comment. I will work on the changes and keep this PR's description up to date as I make progress.

Original PR: #8831
Triggering comment (#8831 (comment)):

Thanks for the review @copilot. Addressed the name-resolution edge cases (anonymous class with an empty .name and no static scriptName) in 05318dc:

Addressed (threads resolved):

• toLowerCamelCase now returns the input unchanged for empty/falsy values instead of throwing on str[0]. This also defuses the two warning-string crashes (component.js and handlers/script.js).
• registerScript logs an error and returns early when no name resolves, so it no longer assigns __name = undefined, calls add(), or pushes a nameless entry to ScriptTypes.
• ScriptComponent.create returns null (and logs) instead of indexing the instance under an undefined/empty key (this.undefined).
• ESM script handler skips exports whose name cannot be resolved rather than registering under an invalid key.

Added tests for the registerScript and ScriptComponent.create fail-fast paths.

Not addressed (left open):

• The this._scripts.hasOwnProperty(...) suggestion in script-registry.js. It's a valid hardening point, but that line is pre-existing (untouched by this PR) and unrelated to the name-resolution fix, so it's out of scope here. Happy to do it as a separate small PR.