v0.0.18

• Conditional polling: the loader now sends If-None-Match on repeat eval-with-context polls and
  honors a 304 Not Modified by keeping the cached evaluations instead of re-downloading the full
  payload. The ETag is stored per-request-URL (which embeds the encoded context) and LRU-bounded to
  16 entries, so a context switch can never replay a stale ETag. Steady-state polling collapses to a
  304 when neither the workspace version nor the context has changed (qfg-iikt).
• Fix: a 304 now returns the payload cached for that exact context, so the updateContext(A) →
  updateContext(B) → updateContext(A) pattern can no longer leave the previous context's
  evaluations in the single shared config slot and serve the wrong context's values (qfg-iikt).
• Fix: polling now starts and self-heals even when the very first poll fetch rejects (a startup
  network blip with both primary and secondary briefly unreachable). Previously a rejected bootstrap
  fetch left polling permanently dead — config frozen with no recovery after connectivity returned.
  The recurring loop is now scheduled regardless of the first fetch's outcome, matching the
  steady-state loop's own resilience (qfg-8uw5).