Simplify routing to award assignment, seed all CSV entries, fix category mapping

- Remove RoutingRule model and routing engine (replaced by direct award assignment)
- Simplify RoutingMode enum: PARALLEL/POST_MAIN → SHARED, keep EXCLUSIVE
- Remove routing router, routing-rules-editor, and related tests
- Update pipeline, award, and notification code to remove routing references
- Seed: include all CSV entries (no filtering/dedup), AI screening handles duplicates
- Seed: fix non-breaking space (U+00A0) bug in category/issue mapping
- Stage filtering: add duplicate detection that flags projects for admin review

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/lib/pipeline-conversions.ts

@@ -7,7 +7,7 @@ type TrackInput = {
   slug: string
   kind: 'MAIN' | 'AWARD' | 'SHOWCASE'
   sortOrder: number
-  routingMode: 'PARALLEL' | 'EXCLUSIVE' | 'POST_MAIN' | null
+  routingMode: 'SHARED' | 'EXCLUSIVE' | null
   decisionMode:
     | 'JURY_VOTE'
     | 'AWARD_MASTER_DECISION'

src/lib/pipeline-defaults.ts

@@ -110,7 +110,7 @@ export function defaultAwardTrack(index: number): WizardTrackConfig {
     slug: slugify(name),
     kind: 'AWARD',
     sortOrder: index + 1,
-    routingModeDefault: 'PARALLEL',
+    routingModeDefault: 'SHARED',
     decisionMode: 'JURY_VOTE',
     stages: [
       { name: 'Evaluation', slug: 'evaluation', stageType: 'EVALUATION', sortOrder: 0, configJson: defaultEvaluationConfig() as unknown as Record<string, unknown> },
@@ -125,7 +125,6 @@ export function defaultNotificationConfig(): Record<string, boolean> {
     'stage.transitioned': true,
     'filtering.completed': true,
     'assignment.generated': true,
-    'routing.executed': true,
     'live.cursor.updated': true,
     'cohort.window.changed': true,
     'decision.overridden': true,