`file.*` diagnostics

Owner: the runtime spec (defs/runtime.ts). The status is the code's own; the exit comes from its category (CATEGORIES). A warning or info code never sets the status or the exit.

Code	Category	Severity	Status	Exit	Retry	Fix	Args
`file.hash_mismatch`	input	error	400	2	no	—	`expected`, `actual`
`file.not_readable`	not_found	error	404	3	no	—	—
`file.ticket_invalid`	policy	error	403	4	no	—	—
`file.upload_denied`	policy	error	403	4	no	—	—
`file.upload_invalid`	input	error	400	2	no	—	`field`

file.* diagnostics

`file.*` diagnostics