- SyncManager now uses a conflated request channel instead of tryLock, so a
request that arrives during a sync (e.g. add-source switching the active
server) is queued and runs afterwards against the then-active source
instead of being dropped.
- Paged loops count raw server rows, not accepted entities, so an empty-id
row on an otherwise full page no longer ends the scan early and prunes
the unseen tail.
- The cap now fails when the page just past it is non-empty, not only when
it is full, matching the bound the error message reports.
- fetchRank rethrows the cap instead of downgrading an over-cap album scan
to empty ranks.
- Docs: the mutex lives in SyncManager, and the prune still holds the
existing-id set.
A full page at the cap is not proof of truncation, so a library whose
size is an exact multiple of the page size failed for no reason. Each
paged loop now keeps going one page past the cap and only throws when
that page comes back non-empty; a library up to the cap syncs normally.
Add a boundary test for the exact-cap case.
Also note the accepted per-batch observer invalidation churn in the sync
code and the architecture doc.
adds docs/architecture.md (stack, layers, data model, sync, search, networking, testing, CI), docs/implementation-plan.md (phases and status), and AGENTS.md for agents and contributors
austinried