fix: address codex review round 3

Record the freshness token observed AFTER the read (re-stat post-read, falling
back to the routing stat if the file vanished) so the version returned/recorded
matches the bytes returned — a writer racing between the routing stat and the
read can no longer make a follow-up edit spuriously stale. Stream reads when the
backend reports no size, so a size-less backend never buffers a large file
whole. Update the cordis-catalog link map to the current filesystem API symbols
(FileContextExec/FileReadRequest/FileReadOutcome/FsInfo/FsWriteExpectation).

scripts/gen-cordis-catalog.ts

@@ -77,13 +77,14 @@ const LINK_MAP: Record<string, string> = {
   BashTaskRead: 'bash.md',
   FsEditOutcome: 'filesystem.md',
   FsEditRequest: 'filesystem.md',
-  FsExecContext: 'filesystem.md',
-  FsExpectation: 'filesystem.md',
-  FsReadOutcome: 'filesystem.md',
-  FsReadRequest: 'filesystem.md',
+  FsInfo: 'filesystem.md',
   FsTarget: 'filesystem.md',
   FsVersion: 'filesystem.md',
+  FsWriteExpectation: 'filesystem.md',
   FsWriteOutcome: 'filesystem.md',
+  FileContextExec: 'filesystem.md',
+  FileReadRequest: 'filesystem.md',
+  FileReadOutcome: 'filesystem.md',
 }
 
 /** One harness event, extracted from an `interface Events` block. */