Review round three found four seam defects:
- A watch() disposer only removed the observer from the set; an invocation
already chained onto the watcher tail still ran after disposal. Watchers
now carry an active flag checked when a queued invocation would start,
and the service dispose drain awaits started invocations (pendingTails)
beside the write queues, so disposal is quiescent.
- The settings/updated manual fan-out caught only synchronous throws; an
async listener rejection escaped as an unhandled rejection. Thenable
returns are now contained through the shared listener diagnostic, and
the event contract documents that the INVARIANT rethrow serves
synchronous listeners only.
- structuredClone admitted Dates, Maps, BigInts, and cycles that YAML/JSON
storage silently distorts on reload (a Date lands as a timestamp string,
a Map as a plain map, a BigInt as a number). The write snapshot is now a
single-pass cloneJsonShaped walk that rejects non-JSON values with their
path before anything persists.
- mergeLayers' per-entry undefined guard became dead code once the clone
strips undefined entries at the boundary; removed, with the sparse-patch
contract restated at its enforcement point.
Both files fit their ceilings on each parent; the merge union of this
branch's settings rows with master's typert row and source-launch rewrite
overflows by 6 and 2 words. Every added row is a fixed-format layout or
package-table entry with nothing to relocate, so the ceilings move to the
union size.
- .loadingFloat moved after the .status/.error block (its padding was
losing the same-specificity race) and re-anchored bottom-right: the
truncated/error rows own the bottom left and keep rendering through a
scan, so the pill can never cover them; confirmCreate's relist now
clears the stale failure text like every other scan launch.
- The close edge resets loading, so the slow-scan effect disarms while
hidden and a reopened dialog waits out a fresh silence window
(regression test added).
- The truncated note's survival through a scan is now asserted in the
slow-scan test; the wait-bound test moved to fake timers with the
200ms bound explicit.
- select()'s exemption from the one-frame rule and the constants' local
calibration premise are recorded in JSDoc and the capability-seam
Agent Note; the themed-scrollbars note's rebinding enumeration is
replaced by a pointer to the mechanical gate (it had drifted twice).
Both pairs re-recorded.
The loading pill's layer-2 background made the sheet an
elevated-surface painter, and the ui-theme scrollbar invariant rightly
flagged what was already latent: the dialog's columns scroll on an l2
card while the thumbs rendered in the base-surface pair. Rebind the
indirection on the card rule so it inherits to the scrolling columns.
`isInheritedSeq` had no production caller — only its own tests — so it was
a public core export shaped by nothing. A bracket owner reads the boundary
positionally; the helper belongs with the compaction seam, where a real
consumer decides its signature.
Also condense the `session/inherited` and `lastActivityTime` docs.
Navigations keep the previous view rendering while scanning: target and
parent legs land as one two-pane frame when the parent leg settles within
a 200ms wait bound (past it the target lands alone and the late leg
upgrades in place; Escape inside the landing window withdraws the
navigation). The loading indicator floats over the content on the card
background and appears only once a scan outlives a 300ms silence window,
so navigation never shifts the columns or flashes an intermediate frame.
The truncated note now describes the on-screen panes instead of hiding
during scans.
A plugin owning a standalone open/close bracket cannot tell a dead marker
from a live one: an unmatched `compact/start` reads identically whether the
previous writer died mid-compaction or a compaction is running now.
`Session.firstLiveSeq` already holds that answer exactly, but only in memory.
Append the log-only `session/inherited` event at that seq from the seeded
constructor — the single waist all six seeded-start paths pass through
(resume, configured startup on a persisted id, `sessions.fork()`, a subagent
fork child, `adopt()`'s live prefix, and a bare seeded `create`). Read it
through the new `isInheritedSeq(events, seq)`.
The constructor placement means persistence needs no changes: the marker is
already in `events` when a backend captures the creation seed, so it rides
the ordinary seed path with no load-time write. It also covers fork, where
the inherited bracket's owner may still be running — the case a
persistence-layer boundary could not reach.
Activity ordering excludes the boundary through `lastActivityTime()`, since
lazy resume makes browsing a pickup and the three call sites would otherwise
float every opened session to the top of a picker or list.
The seat's height publisher needs a ResizeObserver stub in every spec that
renders ConversationRoot (jsdom has none), and the two branch-tail StatsLine
assertions move to the grouped detail-row output.
