A flush that rebuilds an evicted session's SDK session stores its observation
flags again, and the cap pass pruned every per-session dict but that one, so the
dict grew one entry per evicted-then-flushed session. The cap pass now prunes it
with the rest.
The peer-failure notice classified platforms with its own {"cli","tui","desktop"}
set, so an ACP session read the gateway wording ("do not suggest peerName"); it
now uses agent.coding_context.INTERACTIVE_CODING_PLATFORMS, which includes acp.
Three getattr/try-except guards existed only for test doubles (a bare __new__
provider, a SimpleNamespace config); the real types always carry the attribute.
Removed, and the two tests build real objects. An unset timeout resolves to the
client's 30s default, so the join-budget test expects 30, not the 5s floor.
Timing tests keep the >= 2s wall-clock bound the testing rules ask for.
b2ee58d24a