refactor(orchestrator): swap SubprocessBottleRunner → ProgrammaticBottleRunner

BottleRunner Protocol tightened: start() → str, freeze/resume/destroy → None.
RunResult removed. lifecycle.py unpacks the slug directly. FakeRunner and
test_runner updated to match. Config.bot_bottle_cli dropped (nothing uses it).

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

tests/unit/orchestrator/_fakes.py

@@ -7,7 +7,7 @@ from __future__ import annotations
 
 from collections.abc import Sequence
 
-from bot_bottle.orchestrator.runner import RunResult, slugify
+from bot_bottle.orchestrator.runner import slugify
 
 
 class FakeForge:
@@ -52,18 +52,15 @@ class FakeRunner:
         label: str,
         prompt: str,
         forge_env: dict[str, str],
-    ) -> RunResult:
+    ) -> str:
         self.calls.append(("start", agent, tuple(bottles), label, prompt, dict(forge_env)))
-        return RunResult(slug=slugify(label), exit_code=0)
+        return slugify(label)
 
-    def freeze(self, slug: str) -> int:
+    def freeze(self, slug: str) -> None:
         self.calls.append(("freeze", slug))
-        return 0
 
-    def resume(self, slug: str, prompt: str) -> RunResult:
+    def resume(self, slug: str, prompt: str) -> None:
         self.calls.append(("resume", slug, prompt))
-        return RunResult(slug=slug, exit_code=0)
 
-    def destroy(self, slug: str) -> int:
+    def destroy(self, slug: str) -> None:
         self.calls.append(("destroy", slug))
-        return 0