* feat(lens): add scripts/lens_dev.sh for one-command lens local dev
* feat: add make lens-dev target
* chore: gitignore .lens-dev local state
* docs(lens): mention make lens-dev in the developer note
* fix(lens): resolve a relative LENS_DEV_CONFIG against the caller's cwd
* fix(lens): random lens-dev master key, verify reused services, drop inherited REDIS_*
* test(lens): cover lens-dev worker token, master key, env and cleanup
* fix(lens): skip compose postgres when LENS_DEV_DATABASE_URL is set
* test(lens): external LENS_DEV_DATABASE_URL never starts compose postgres
