The /sx/ prefix mismatch: defpage declares paths like /language/docs/<slug>
but browser URLs are /sx/(language.(doc.slug)). find-matching-route used
starts-with? "/(", missing the /sx/ prefix entirely.
Fix: find-matching-route now uses (index-of path "/(") to detect the SX
URL portion regardless of prefix. Works for /sx/, /myapp/, any prefix.
No hardcoded paths.
Also fixed deps-satisfied?: nil deps (unknown) now returns false instead
of true, preventing client-side eval of pages with unresolved components.
Correctly falls back to server fetch.
Verified with Playwright: clicking "Getting Started" on the docs page now
shows "sx:route deps miss for docs-page" → "sx:route server fetch" instead
of the old "sx:route no match (51 routes)".
2 new router tests for prefix stripping. 2914/2914 total, zero failures.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>