* perf(runtime): memoize onPtyData tail wait scan to halve per-chunk work
onPtyData runs per raw PTY chunk (hundreds/sec during verbose builds and
agent token streaming). For any terminal past the 2000-line / 256KB tail
cap it built the full wait text (a map/trim/filter/join over the entire
retained tail) and lower-cased + scanned it twice per chunk — once for the
pre-append tail and once for the post-append tail — producing hundreds of
KB of transient string allocation per chunk and steady main-process GC/CPU
pressure under load.
Cache the post-append wait state (text + lower-cased blocked-signal scan)
on the pty/leaf record and reuse it as the next chunk's pre-append state.
The prior chunk's post-append tail *is* this chunk's pre-append tail, so
the cached scan is exact; reuse is gated on fromTail so the empty-tail
preview fallback (which depends on a value updated after append) is never
reused stale. This drops per-chunk full-tail scans from 2N to N+1.
Adds an equivalence test proving the memoized stamping is byte-for-byte
identical to the recompute-both-sides reference across split prompts,
partial lines, ready-after-blocked demotion, and tail eviction, plus a
count assertion (memoized N+1 vs reference 2N scans).
Co-authored-by: Orca <help@stably.ai>
* fix(runtime): clear memoized wait cache when a disconnected transcript is pruned
pruneDisconnectedPtyTranscript empties a disconnected PTY record's retained
tail but left the new tailWaitState memo untouched. If such a record resumed
output (adoption/reattach while a leaf keeps it alive), onPtyData would reuse
the stale pre-prune wait state (fromTail=true) as the next chunk's previous
state and could miss or mis-time the waitBlockedAt stamp on that first chunk.
Clear tailWaitState in the prune reset so the resumed chunk recomputes from the
emptied tail.
Adds a runtime guard (prune clears the cache) and a sim equivalence test
covering prune-then-resume stamping.
Co-authored-by: Orca <help@stably.ai>
* docs(runtime): reword wait-scan comment that named a removed function
Co-authored-by: Orca <help@stably.ai>
---------
Co-authored-by: Orca <help@stably.ai>
