feat(hooks): add /stop-continuation command to halt all continuation mechanisms (#1316)

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: justsisyphus <justsisyphus@users.noreply.github.com>
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/features/builtin-commands/commands.ts

@@ -2,6 +2,7 @@ import type { CommandDefinition } from "../claude-code-command-loader"
 import type { BuiltinCommandName, BuiltinCommands } from "./types"
 import { INIT_DEEP_TEMPLATE } from "./templates/init-deep"
 import { RALPH_LOOP_TEMPLATE, CANCEL_RALPH_TEMPLATE } from "./templates/ralph-loop"
+import { STOP_CONTINUATION_TEMPLATE } from "./templates/stop-continuation"
 import { REFACTOR_TEMPLATE } from "./templates/refactor"
 import { START_WORK_TEMPLATE } from "./templates/start-work"
 
@@ -70,6 +71,12 @@ $ARGUMENTS
 </user-request>`,
     argumentHint: "[plan-name]",
   },
+  "stop-continuation": {
+    description: "(builtin) Stop all continuation mechanisms (ralph loop, todo continuation, boulder) for this session",
+    template: `<command-instruction>
+${STOP_CONTINUATION_TEMPLATE}
+</command-instruction>`,
+  },
 }
 
 export function loadBuiltinCommands(