chore: delete v1 reference code

Removes src/v1/ (37 files) and container/agent-runner/src/v1/ (3 files)
along with the v1 reference note in CLAUDE.md and the now-obsolete
tsconfig exclude. v1 was already out of the runtime path; this just
removes the dead weight.

~8,800 LOC removed, zero runtime change.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

container/agent-runner/tsconfig.json

@@ -10,5 +10,5 @@
     "types": ["bun"]
   },
   "include": ["src/**/*"],
-  "exclude": ["node_modules", "dist", "src/**/*.test.ts", "src/v1/**/*"]
+  "exclude": ["node_modules", "dist", "src/**/*.test.ts"]
 }