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Add deterministic fallback scriptlet bundle so resources count is nonzero

Use standard gorhill/uBlock scriptlets.js source for adblock-rust resource assembler

Fix updater: remove unused Path import, add fallback for scriptlet loading failure

Fix: assemble_scriptlet_resources expects Path not String - write to temp file first

Implement scriptlet resource loading for YouTube/Twitch video ad blocking

Fix Shield popover airspace and add Phase 3 library board core

Fix adblock API compatibility

Phase 2 full adblock + privacy implementation