Merge remote-tracking branch 'origin/master' into feat/read-image-context

# Conflicts:
#	docs/config-catalog.i18n.yaml
#	docs/config-catalog.md
#	docs/config-catalog.zh.md
#	packages/support/llm-replay/src/index.ts
#	packages/support/llm-replay/tests/llm-replay.spec.ts

docs/subsystems/filesystem.md

@@ -136,10 +136,11 @@ interface FsWriteOutcome {
   version: FsVersion
   /**
    * The file's content BEFORE the write, or `null` when the file did not exist
-   * (a create) or was undiffable (binary/non-UTF-8). LF-normalized storage text
-   * (the diff basis), never a diff — a consumer computes the result-time
-   * contextual diff from `before`/`after` when `before` is present, else falls
-   * back to a whole-file diff.
+   * (a create) or the backend declined a contextual basis (for example, a
+   * binary/non-UTF-8 prior file or either overwrite side reaching its exclusive limit).
+   * LF-normalized storage text (the diff basis), never a diff — a consumer
+   * computes the result-time contextual diff from `before`/`after` when
+   * `before` is present, else falls back to a whole-file diff.
    */
   before: string | null
   /** The file's content AFTER the write, LF-normalized to share `before`'s diff basis. */