Part of #1486.

Swap the documented install one-liner from the raw GitHub URL to the short, branded get.aicr.run endpoint, which already serves the same script (verified checksum + Sigstore provenance output is identical):

# before
curl -sfL https://raw.githubusercontent.com/NVIDIA/aicr/main/install | bash -s --
# after
curl -sfL https://get.aicr.run | bash -s --

Only the URL changes — the | bash -s -- invocation and all flags (-d ~/.local/bin, AICR_NO_COMPLETIONS=1, etc.) are unchanged. The install script itself needs no change; it already downloads release artifacts from github.com/NVIDIA/aicr/releases/....

Locations to update (8)

• README.md:33
• DEVELOPMENT.md:11 (the aicrup alias, with -d ~/.local/bin)
• docs/user/tutorial.md:30
• docs/user/index.md:38
• docs/user/installation.md:28
• docs/user/installation.md:34 (-d ~/bin variant)
• docs/user/installation.md:104 (AICR_NO_COMPLETIONS=1 variant)
• demos/validation-acceptance.md:13

Acceptance criteria

• All 8 references use https://get.aicr.run
• No remaining raw.githubusercontent.com/NVIDIA/aicr/main/install references (excluding vendor/.git)
• Flags/variants preserved in each location
• Anchor/link hygiene preserved (lychee clean)
• make qualify green