chore(flags): drop leftover references to the retired async projection flag

apps/sim/lib/knowledge/__integration__/knowledge-projection.integration.ts

@@ -1,8 +1,8 @@
 /**
  * The knowledge projector and the readers that must stay correct while it lags. A GitHub member
  * source's document in a search index is changed by a writer in either projection mode —
- * synchronous, as every writer now is, or deferred, as writers of releases that carried the
- * `knowledge-async-projection` flag were, leaving only a mark — and search is checked before the
+ * synchronous, as every writer now is, or deferred, as writers of earlier releases could be,
+ * leaving only a mark — and search is checked before the
  * projector runs: a revoked member is refused and a granted one is served, on the vector and
  * keyword legs and under the source filter, and a disabled or deleted chunk is gone at once. The
  * projector's own contract follows: it converges the rows and removes the mark, keeps a mark that

packages/db/knowledge-projection.ts

@@ -5,11 +5,11 @@ import type { Sql, TransactionSql } from 'postgres'
 const logger = createLogger('KnowledgeProjection')
 
 /**
- * The transaction setting that skips the synchronous projection triggers. No application writer
- * sets it: every writer's projection rows are written by those triggers in its own transaction.
- * Releases that carried the `knowledge-async-projection` flag set it to leave a chunk write's rows
- * to the projector, which is why a mark can still carry content to project. Either way the
- * triggers mark the document in `knowledge_projection_dirty`.
+ * The transaction setting that skips the synchronous projection triggers. Only the projector sets
+ * it: every other writer's projection rows are written by those triggers in its own transaction.
+ * A mark can still carry content to project, because earlier releases also set it on chunk writes
+ * to leave their rows to the projector. Either way the triggers mark the document in
+ * `knowledge_projection_dirty`.
  */
 const KNOWLEDGE_PROJECTION_MODE_SETTING = 'sim.projection_mode'