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.
_Kerman