BYK's Sentry dev-VM workflow

BYK's Sentry dev-VM workflow: Provision a fresh Coder VM via coder create --copy-parameters-from <existing>. SSH via coder config-ssh then ssh <name>.coder. Rsync modified files to /workspace/sentry, run tests with .venv/bin/pytest -svv --reuse-db. Pre-commit not preinstalled — pip install pre-commit into .venv first. Tear down with coder delete. Implementation + test authoring happens locally; verification on VM. Memcache not running on Coder VMs: cache.add() returns False silently on port 11211, causing lock acquisition failures — check result before entering critical section.