Drop internal filename cross-references from routed reference text

Copilot's review point stands: reference files load per-command, so a
bare "see optimize.md" / "typeset.md" is not meaningful in the routed
context. The guidance reads self-contained now.

Prepared with AI assistance (Claude Code), directed by @pbakaus.

Co-Authored-By: Claude Code <noreply@anthropic.com>

skill/reference/audit.md

@@ -27,7 +27,7 @@ Run comprehensive checks across 5 dimensions. Score each dimension 0-4 using the
 - **Layout thrashing**: Reading/writing layout properties in loops
 - **Expensive animations**: Casual layout-property animation, unbounded blur/filter/shadow effects, or effects that visibly drop frames
 - **Missing optimization**: Images without lazy loading, unoptimized assets
-- **will-change overuse**: `will-change` applied broadly or left on at rest (it is a targeted hint for known expensive animations, not a baseline requirement; see optimize.md)
+- **will-change overuse**: `will-change` applied broadly or left on at rest (it is a targeted hint for known expensive animations, not a baseline requirement)
 - **Bundle size**: Unnecessary imports, unused dependencies
 - **Render performance**: Unnecessary re-renders, missing memoization
 

skill/reference/harden.md

@@ -78,7 +78,7 @@ Systematically improve resilience:
 
 **Responsive text sizing**:
 - Use `clamp()` for fluid typography
-- Set minimum readable sizes (16px body on mobile, matching typeset.md's floor; 14px only for genuinely secondary text. iOS Safari force-zooms focused inputs under 16px, which breaks form layouts)
+- Set minimum readable sizes (16px body on mobile, the same floor the typography guidance sets; 14px only for genuinely secondary text. iOS Safari force-zooms focused inputs under 16px, which breaks form layouts)
 - Test text scaling (zoom to 200%)
 - Ensure containers expand with text