buildNotifier returns a nil interface when BRAIN_NTFY_URL is unset, and
every consumer skips a nil notifier silently. That is right for an
unconfigured homelab and wrong for an alert whose entire value is that
someone finds out: "configured and working" and "never configured" were
byte-identical in behaviour — no error, no warning, only a message that
never arrives, which nobody notices because nobody is waiting for an alert
they have never seen.
Two alerts were dark in production for exactly that reason (#100): the
governance-rewrite alert from #97, and the audit-degradation alert that
reports the audit trail is down. Both were found by firing a real event
and watching nothing happen, not by reading anything.
WARN rather than fatal, deliberately. The brain rule
`empty-credential-must-refuse-to-start-not-switch-modes` says an empty
credential must be a startup error rather than a silent mode switch — but
that is about a control being removed. Here observability degrades, no gate
is bypassed, and refusing to boot would break the unconfigured-homelab case
the nil notifier exists to support. What that rule demands and this
provides is that the mode switch stops being silent.
buildAuditSink already announces its own fallback ("capture audit: slog
sink (BRAIN_LOKI_URL unset)"), so only the notifier needed this.
alertingWarnings is pure and env-injected: the reason this gap survived is
that nothing about it was observable, so the fix is tested rather than
asserted.
Refs #107, #100, #97.
claudeSink wrote every raw transcript into brain/wiki/claude-sessions/facts/
(BM25-indexed), duplicating what ai-sessions' curated summaries already
cover and out-ranking them in search (177,818 vs 45,335 BM25 weight on the
same query, per ai-sessions#10 investigation). Raw dumps now land in
brain/archive/claude-sessions/<host>/ — kept for deep lookups, never
indexed, never deleted.
Refs: ai-sessions#10
brain-gardener#5: the audit's unsourced check was flagging 59 raw
claudewatcher session dumps as high-severity hallucination risk,
because it can't distinguish a first-party observation (a session
transcript) from an external claim needing citation.
Adds WriteNoteOptions.SourceType, emitted as source_type: <value> in
the wing/hall frontmatter route. claudeSink (the claudewatcher sink)
now always sets source_type: internal on the notes it writes.