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>