move mcp-schema to standalone binary in src/claude/

mcp-schema is Claude Code glue — extract from poc-memory
subcommand to src/claude/mcp-schema.rs standalone binary.
Update Python MCP bridge to call the new binary.

Co-Developed-By: Kent Overstreet <kent.overstreet@linux.dev>

src/main.rs

@@ -220,10 +220,6 @@ EXAMPLES:
     /// Admin operations (fsck, health, import, export)
     #[command(subcommand)]
     Admin(AdminCmd),
-
-    /// Output MCP tool definitions as JSON (for generic MCP bridge)
-    #[command(name = "mcp-schema")]
-    McpSchema,
 }
 
 #[derive(Subcommand)]
@@ -818,7 +814,7 @@ impl Run for Command {
             Self::Cursor(sub)            => sub.run(),
             Self::Agent(sub)             => sub.run(),
             Self::Admin(sub)             => sub.run(),
-            Self::McpSchema              => cli::misc::cmd_mcp_schema(),
+            // mcp-schema moved to standalone binary src/claude/mcp-schema.rs
         }
     }
 }