formatNewEntries/formatSignalEntries advanced the tracker before
capture.js called the API, so a failed save silently skipped that
delta forever. The formatters now return { formatted, lastUuid } and
capture.js advances the cursor after addMemory succeeds — a failure
leaves the cursor put and the next Stop recaptures. Found via #96,
originally spotted against the old architecture by @catShaark in #84.
Fixes#96
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Dhravya Shah