story-kit: create 107_story_test_coverage_http_assets_rs_to_85

.story_kit/work/1_upcoming/107_story_test_coverage_http_assets_rs_to_85.md

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+---
+name: "Test Coverage: http/assets.rs to 85%"
+---
+
+# Story 107: Test Coverage: http/assets.rs to 85%
+
+## User Story
+
+As a developer, I want http/assets.rs to have at least 85% test coverage, so that regressions in static asset serving are caught early.
+
+## Acceptance Criteria
+
+- [ ] server/src/http/assets.rs reaches at least 85% line coverage (currently 70%, 18 lines missed)
+- [ ] cargo clippy passes with no warnings
+- [ ] cargo test passes with all tests green
+- [ ] No changes to production code, only test code added
+
+## Out of Scope
+
+- TBD