clean lib/src/terminal/ to the project bar (T-107)

T-107 (b): treat the in-tree terminal as ours, not vendored.

* custom_text_edit.dart — drop the row of commented-out `// print(...)`
  debugging stubs that shipped with the fork.
* parser.dart — the "TODO: G2/G3" lines for unimplemented VT220
  charset designators become a clear "not implemented" note; the
  stale "TODO: Normal/Application Keypad" tags on `>` / `=` get
  removed since the handlers ARE wired.
* keytab.dart — the bare "TODO: support VT52" turns into a comment
  explaining that ANSI=false records are intentionally skipped
  (no clide consumer asks for VT52).
* terminal_view.dart — the lone `// ignore:
  invalid_use_of_protected_member` keeps the suppression but gets
  an inline justification per CLAUDE.md (TerminalView owns its own
  ShortcutManager so terminal keybindings fire before the app's
  Shortcuts ancestor; wrapping in Shortcuts would invert that).

parser.dart's 1139-LOC size is parked as T-123 — split is too
invasive to fold here without conflicting with T-91's coverage
sweep on the same area.

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

lib/src/terminal/src/core/escape/parser.dart

@@ -105,12 +105,14 @@ class EscapeParser {
     // 'P'.charCode: _unsupportedHandler, // Sixel
     // 'c'.charCode: _unsupportedHandler,
     // '#'.charCode: _unsupportedHandler,
-    '('.charCode: _escHandleDesignateCharset0, //  SCS - G0
-    ')'.charCode: _escHandleDesignateCharset1, //  SCS - G1
-    // '*'.charCode: _voidHandler(1), // TODO: G2 (vt220)
-    // '+'.charCode: _voidHandler(1), // TODO: G3 (vt220)
-    '>'.charCode: _escHandleResetAppKeypadMode, // TODO: Normal Keypad
-    '='.charCode: _escHandleSetAppKeypadMode, // TODO: Application Keypad
+    '('.charCode: _escHandleDesignateCharset0, // SCS — G0
+    ')'.charCode: _escHandleDesignateCharset1, // SCS — G1
+    // G2 (`ESC *`) and G3 (`ESC +`) charset designators are VT220+
+    // sequences we don't honour — no consumer in clide selects past
+    // G0/G1. Sequences pass through as no-ops (one trailing byte is
+    // consumed by the default parser).
+    '>'.charCode: _escHandleResetAppKeypadMode,
+    '='.charCode: _escHandleSetAppKeypadMode,
   });
 
   /// `ESC 7` Save Cursor (DECSC)

lib/src/terminal/src/core/input/keytab/keytab.dart

@@ -88,7 +88,9 @@ class Keytab {
         continue;
       }
 
-      // TODO: support VT52
+      // VT52 mode (ANSI=false) records are skipped — clide only emits
+      // ANSI/VT100+ sequences. No consumer asks for VT52 today; if one
+      // does, this branch is where the lookup would flip.
       if (record.ansi == false) {
         continue;
       }

lib/src/terminal/src/terminal_view.dart

@@ -360,6 +360,13 @@ class TerminalViewState extends State<TerminalView> {
       return resultOverride;
     }
 
+    // ShortcutManager.handleKeypress is @protected — it's only public
+    // for the Shortcuts widget to call internally. We own our own
+    // ShortcutManager because the terminal has its own keybinding
+    // surface (defaultTerminalShortcuts: Ctrl+C → kill, Tab handoff
+    // rules, etc.) that needs to fire BEFORE the app's Shortcuts
+    // ancestor. Wrapping in a Shortcuts widget would invert that.
+    // T-107 approved leaving this suppression with an inline reason.
     // ignore: invalid_use_of_protected_member
     final shortcutResult = _shortcutManager.handleKeypress(
       focusNode.context!,

lib/src/terminal/src/ui/custom_text_edit.dart

@@ -241,42 +241,27 @@ class CustomTextEditState extends State<CustomTextEdit> with TextInputClient {
 
   @override
   void performAction(TextInputAction action) {
-    // print('performAction $action');
     widget.onAction(action);
   }
 
   @override
-  void updateFloatingCursor(RawFloatingCursorPoint point) {
-    // print('updateFloatingCursor $point');
-  }
+  void updateFloatingCursor(RawFloatingCursorPoint point) {}
 
   @override
-  void showAutocorrectionPromptRect(int start, int end) {
-    // print('showAutocorrectionPromptRect');
-  }
+  void showAutocorrectionPromptRect(int start, int end) {}
 
   @override
-  void connectionClosed() {
-    // print('connectionClosed');
-  }
+  void connectionClosed() {}
 
   @override
-  void performPrivateCommand(String action, Map<String, dynamic> data) {
-    // print('performPrivateCommand $action');
-  }
+  void performPrivateCommand(String action, Map<String, dynamic> data) {}
 
   @override
-  void insertTextPlaceholder(Size size) {
-    // print('insertTextPlaceholder');
-  }
+  void insertTextPlaceholder(Size size) {}
 
   @override
-  void removeTextPlaceholder() {
-    // print('removeTextPlaceholder');
-  }
+  void removeTextPlaceholder() {}
 
   @override
-  void showToolbar() {
-    // print('showToolbar');
-  }
+  void showToolbar() {}
 }