chore: release 2.19.0

[github-actions]

🤖 I have created a release beep boop

2.19.0 (2026-07-31)

Features

• *sum: treat uppercase variant of *sums as checksum file (941f472)
• curl: add more option arg (non-)completions (ee74f36)
• prek: add fallback 3rd party completion loader (23361e3)
• sudo: recognize --preserve-env taking an arg (a33deaa)
• topgrade: add fallback 3rd party completion loader (c285005)
• xh: add 3rd party fallback completion loader (f5c4c0d)

Bug Fixes

• avoid consuming stdin on remote scp/ssh/rsync completion wait (30f9da8)
• make: offer phony targets as-is instead of collapsing them (b29d4ea), closes #1219
• make: properly skip the "Not a target" block in the helper AWK (6bb9953)
• sudo: do not offer completions after --help/--version (35df24e)

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