docs: update Claude Code releases to v2.1.56

- Updated tracking: v2.1.52 → v2.1.56
- v2.1.56: VSCode extension crash fix (Windows)
- v2.1.55: BashTool EINVAL fix on Windows
- v2.1.53: Stability release (Windows panics, WebAssembly crashes Linux/Windows, Remote Control shutdown fix)

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

machine-readable/claude-code-releases.yaml

@@ -3,8 +3,8 @@
 # Purpose: Track Claude Code product releases for documentation sync
 # Maintained: Manual updates when new releases are announced
 
-latest: "2.1.52"
-updated: "2026-02-24"
+latest: "2.1.56"
+updated: "2026-02-25"
 
 # ════════════════════════════════════════════════════════════════
 # RELEASES (newest first, condensed highlights only)
@@ -15,6 +15,26 @@ releases:
   # 2.1.x Series (January-February 2026)
   # ─────────────────────────────────────────────────────────────
 
+  - version: "2.1.56"
+    date: "2026-02-25"
+    highlights:
+      - "VSCode: Fixed another cause of 'command claude-vscode.editor.openLast not found' crashes"
+    breaking: []
+
+  - version: "2.1.55"
+    date: "2026-02-25"
+    highlights:
+      - "Fixed BashTool failing on Windows with EINVAL error"
+    breaking: []
+
+  - version: "2.1.53"
+    date: "2026-02-25"
+    highlights:
+      - "Stability fixes: panic on Windows, crashes on process spawn (Windows), WebAssembly crashes (Linux x64/Windows x64/ARM64)"
+      - "Fixed graceful shutdown leaving stale sessions with Remote Control; `--worktree` flag sometimes ignored on first launch"
+      - "Fixed UI flicker where user input disappeared briefly after submission; bulk agent kill (ctrl+f) single notification"
+    breaking: []
+
   - version: "2.1.52"
     date: "2026-02-24"
     highlights: