Classify save failures as transient or terminal (`transient-error?`
over the repo retryable types plus `:invalid-save-response`).
Transient failures keep the head commit queued under a new `:retrying`
status and resend it with backoff (2s/8s/20s, then terminal):
stamp rotation reuses the same `:commit-id`, the in-flight guard
prevents double-sends, and episode tokens silence stale timers.
One tagged reconnect notice per episode (hidden on save and on
terminal failure, silent recovery) plus a `:retrying` save-indicator
state; the browser `online` event and new edits resume the episode.
Terminal failures keep the exact `:error` path. Covers tasks 4, 6
and 7 with 31 persistence tests; updates the persistence memory.
Relates to #11724
AI-assisted-by: muse-spark-1.3-contributor
Connectivity and gateway failures (network, offline, 502/503 and
nitrate configuration) are not application defects, but offline fell
through to :default and 502/503 rendered exception-page, so they
reached the internal error reports and alerts with the full payload
(stack plus the last events). They are now classified as environment
failures and reported as audit-only handled-exception events.
generate-report accepts an explicit :format, as keyword arguments or as
a trailing map. :compact keeps the context header plus type, code and
uri, and skips the stack, the ex-data dump (which may contain request
headers) and the last-events list. flash derives the payload format from
the cause, so environment failures get a compact report; the audit event
name stays the canonical one requested by the caller
(handled-exception/unhandled-exception) because external tooling filters
on those names. Environment fingerprints drop the stack frame, so
grouping does not depend on the internal call site.
submit-report now requires an exception cause: a report without one is
ignored instead of using a separate fallback fingerprint, so a single
fingerprint format governs every report.
:offline gets its own handler and both connectivity handlers show the
new errors.connection-error message instead of the generic toast.
Closes#11743
AI-assisted-by: deepseek-v4.1-flash
