refactor: deduplicate CLAUDE_BINARY constant across _agent and _console_emitter

Both modules defined the same _CLAUDE_BINARY = "claude" constant independently.
Promote to a single public CLAUDE_BINARY in _agent.py (the natural owner) and
import it in _console_emitter.py.

Co-authored-by: Ralphify <noreply@ralphify.co>

Author: 2 people

src/ralphify/_agent.py

@@ -54,7 +54,8 @@
 _STDERR: OutputStream = "stderr"
 
 # Agent binary name that supports --output-format stream-json.
-_CLAUDE_BINARY = "claude"
+# Public because _console_emitter also needs this for display logic.
+CLAUDE_BINARY = "claude"
 
 # CLI flags appended when streaming mode is used.
 _OUTPUT_FORMAT_FLAG = "--output-format"
@@ -269,7 +270,7 @@ def _supports_stream_json(cmd: list[str]) -> bool:
     if not cmd:
         return False
     binary = Path(cmd[0]).stem
-    return binary == _CLAUDE_BINARY
+    return binary == CLAUDE_BINARY
 
 
 def _readline_pump(

src/ralphify/_console_emitter.py

@@ -40,6 +40,7 @@
     RunStoppedData,
 )
 from ralphify import _brand
+from ralphify._agent import CLAUDE_BINARY
 from ralphify._output import format_duration
 
 _ICON_SUCCESS = "✓"
@@ -94,8 +95,6 @@
 
 # ── Claude binary detection ───────────────────────────────────────────
 
-_CLAUDE_BINARY = "claude"
-
 
 def _is_claude_command(agent: str) -> bool:
     """Return True if *agent* is a Claude Code command."""
@@ -105,7 +104,7 @@ def _is_claude_command(agent: str) -> bool:
         return False
     if not parts:
         return False
-    return Path(parts[0]).stem == _CLAUDE_BINARY
+    return Path(parts[0]).stem == CLAUDE_BINARY
 
 
 # ── Tool argument abbreviation ────────────────────────────────────────