* chore: upgrade bun to 1.4.0 in dockerfiles and CI pins
* chore: move deno last in the language picker and relabel it Deno
* chore: move deno last in the pipeline language picker too
* chore: pin debugger image to bun 1.4.0 and trim the deno picker comment
* chore: state the deno picker constraint without referencing the old order
* fix: stamp bun lockfiles back to v1 while the fleet predates bun 1.4
* fix: ask bun for a v1 lockfile instead of rewriting one, and refuse an escalated lock
* chore: warn instead of silently storing a lockfile with no readable version