Add stale recovery to tracker mapping worker

The tracker-mapping worker clears mapping_requested_at at claim time, so
a crash or hard failure between Process phases left the pattern dequeued,
unmapped, and with nothing to re-trigger it. Only an incidental sibling
remap could rescue it, so a lone pattern could stay stranded forever.

Implement the worker.StaleRecoverer interface, mirroring the enrichment
worker. ResetStaleMappings re-arms rows that were claimed but never
assigned a catalog row (common_tracker_pattern_id IS NULL) once idle past
a configurable window; a successful Process always assigns one via the
unmatched fallback, so the predicate cleanly detects interrupted runs and
self-heals after a single pass. ClearMappingRequestedAt now bumps
updated_at so the stale clock starts at claim time and the sweep never
recycles an in-flight claim.

Plumb a StaleAfter knob (default 600s) through the config struct, builder
env var, probod wiring, and Helm templates.

Signed-off-by: Émile Ré <emile@probo.com>

contrib/helm/charts/probo/templates/deployment.yaml

@@ -273,6 +273,10 @@ spec:
             - name: TRACKER_MAPPING_MAX_CONCURRENCY
               value: {{ .Values.probo.trackerMappingWorker.maxConcurrency | quote }}
             {{- end }}
+            {{- if .Values.probo.trackerMappingWorker.staleAfter }}
+            - name: TRACKER_MAPPING_STALE_AFTER
+              value: {{ .Values.probo.trackerMappingWorker.staleAfter | quote }}
+            {{- end }}
             {{- if .Values.probo.trackerMappingWorker.agentTimeout }}
             - name: TRACKER_MAPPING_AGENT_TIMEOUT
               value: {{ .Values.probo.trackerMappingWorker.agentTimeout | quote }}

contrib/helm/charts/probo/values-production.yaml.example

@@ -176,11 +176,13 @@ probo:
   #   temperature: "0.1"
   #   maxTokens: "4096"
 
-  # Tracker mapping worker tuning (optional; seconds for interval/agentTimeout).
+  # Tracker mapping worker tuning (optional; seconds for
+  # interval/staleAfter/agentTimeout).
   # Keep concurrency modest to stay under OpenAI/Firecrawl limits and the DB pool.
   # trackerMappingWorker:
   #   interval: 10
   #   maxConcurrency: 3
+  #   staleAfter: 600
   #   agentTimeout: 45
   #   agentMaxTurns: 4
 

contrib/helm/charts/probo/values.yaml

@@ -276,12 +276,14 @@ probo:
     temperature: ""
     maxTokens: ""
 
-  # Tracker mapping background worker tuning (optional). interval and
-  # agentTimeout are in seconds. Keep concurrency modest to stay under
-  # OpenAI/Firecrawl rate limits and the database connection pool.
+  # Tracker mapping background worker tuning (optional). interval,
+  # staleAfter, and agentTimeout are in seconds. Keep concurrency modest
+  # to stay under OpenAI/Firecrawl rate limits and the database
+  # connection pool.
   trackerMappingWorker:
     interval: 10
     maxConcurrency: 3
+    staleAfter: 600
     agentTimeout: 45
     agentMaxTurns: 4