bug: knowledge add index-type best failing on linux #3139

Checks

• I have searched github.com/aws/amazon-q-developer-cli/issues and there are no duplicates of my issue
• I have run q doctor in the affected terminal session
• I have run q restart and replicated the issue again

Operating system

Ubuntu

Expected behaviour

User should be able to add a new file to the /knowledge base with Best index type regardless of their machine's operating system

Actual behaviour

/knowledge add <filename> --index-type Best would result in Error: Failed to add: Invalid embedding type 'Best'. Valid options are: fast, best on Linux, even after changing to best (lowercase). The same command works perfectly fine on macOS

Steps to reproduce

/knowledge add <filename> --index-type Best
or
/knowledge add <filename> --index-type best

Environment

[q-details]
version="1.17.1"
hash="52301a3b0f81abff5ecde04a02481734c5c7ecc4"
date="2025-09-30T22:23:06.501414Z+(9d+ago)"
variant="minimal"

[system-info]
chip=""
total-cores=2
memory="7.74+GB"

[system-info.os.linux]
kernel_version="6.8.1-1015-realtime"
id="ubuntu"
name="Ubuntu"
pretty_name="Ubuntu+24.04.2+LTS"
version_id="24.04"
version="24.04.2+LTS+(Noble+Numbat)"

[environment]
cwd="/home/USER"
cli-path="/home/USER"
os="Linux"
shell-path="/usr/bin/zsh"
shell-version="5.9"
install-method="unknown"