Merge master 01d96c168a84227374e3aa741e94ddfbb498e27e, observed when
this integration started, after the published 6de3db41 checkpoint. Keep
master's author history and preserve the release writer, adjacent
migrations, historical Session generations, and parent-owned catalogs.
Combine blank Session writer acquisition and superseded-startup
cancellation with the release branch's projection refresh and panel
preservation. A startup acquisition may finish after a later navigation,
but must not retain a stale main Session or reveal its Conversation.
Update the existing regression's retention expectation while preserving
its panel and active-navigation assertions.
Keep the release catalog loading, known-leaf, and parent availability
behavior alongside master's completed-turn status and aligned sidebar
icons. Regenerate the config locations and pair the combined README
contracts. Preserve upstream's Linux process-state assertion repair.
Assistant prose that references a workspace-contained local media path
(e.g. ``) now renders through a same-origin
`GET|HEAD /api/file?path=` route instead of inert alt text.
- ui-primitives: MarkdownText gains a settled-only MarkdownPathImages
vocabulary gate (same posture as file mentions); no vocabulary means
byte-identical output.
- ui-chat: AssistantMarkdown supplies a page-stable rewrite vocabulary
for absolute POSIX paths (local-path-media.ts).
- session-controller: SessionMediaReferences plugin contribution mounts
the route on the authenticated connection.fetch channel; per-request
policy = workspace-root containment after realpath, regular file,
allowlisted media extension (images additionally signature-checked),
range/HEAD streaming, private no-store + nosniff, fail-closed statuses.
- Agent Note added (feature/2026-09-07-session-prose-local-media-display).
Closes#3662.
The persistence seam is now create/open/stat/list returning per-session
SessionHandles (read/append/flush/close); every log read and write flows
through the owning handle. The seam package exports only the service and
handle contracts, consumer-visible errors, and pure durable-data
validation helpers; each backend owns its complete storage runtime, and
the shared contract suites pin equivalent observable behavior. The
backend routes published sessions' live events by id into the active
write handle; agent-loop only acquires, seeds, and closes the handle.
Resume appends interruptedTurnClosers through its write handle;
session-query owns the revision-keyed cold cache. Legacy-only surfaces
are removed in the same swap: locate/readRaw/supportsRawArtifacts, the
legacy event-shape read migration, zstd torn-frame salvage,
DSH_SESSION_JSONL, and hook transcript_path population; a torn final
zstd frame is discarded whole; the session-list cold blank probe returns
on stat metadata (eventCount derived from the last physical row,
sizeBytes). The WebUI ZIP export serializes the logical log from a read
handle, so both backends export identically.
Refs #3245
Single RemoteError with a merge-extensible, domain-prefixed code map;
owners throw at the failure point; streams surface marked failures;
clients consume ctx.remote directly with isRemoteFailure as the only
discrimination point and construct no failure instances.
Tianyi Cui