chore(deploy): empty commit to force CF Workers Builds rebuild (#144)

Workers Builds reported success on 1a1fd4e (PR #141 merge) at 2026-04-26T19:18:49Z, but the deployed bundle is still serving pre-#141 tracing.ts (envelope still has `index_source` field that was deleted in the refactor; no `fetches[]` array). Suspect stale build cache or ref-tracking issue on the CF integration. This empty commit gives the build a fresh SHA to react to.

If this doesn't resolve within ~5 min, the next step is dashboard-side investigation of Workers Builds settings — not a code fix.

Co-authored-by: Klappy (via Claude) <claude@klappy.dev>

Author: klappy