Parent: #206
Goal
Add a latest-state watch channel in which receivers independently track whether they have observed the current version while intermediate updates may coalesce.
Contracts
- The channel always retains one current value.
- Each receiver tracks its own observed version.
borrow does not implicitly consume a change unless the selected API explicitly says so.- A final unseen value remains observable before disconnection is reported.
Acceptance criteria
- Cover receiver cloning, subscriptions, change coalescing, cancellation, final-value draining, disconnection, and dropping replaced values outside internal locks.
- Compare notification and borrow/update paths with Tokio watch.
- Keep versioning and waiter machinery private.
Depends on #208 and the taxonomy in #167.
Parent: #206
Goal
Add a latest-state watch channel in which receivers independently track whether they have observed the current version while intermediate updates may coalesce.
Contracts
borrowdoes not implicitly consume a change unless the selected API explicitly says so.Acceptance criteria
Depends on #208 and the taxonomy in #167.