fix(installer): report exact installation path

[ss-o]

Summary

• remove punctuation from the path printed after Successfully installed at
• add a regression test that strips ANSI styling and verifies the exact reported path
• regenerate the published installer checksum

Validation

• sh ./tests/installers.sh (31 checks passed)
• shellcheck public/sh/*.sh
• trunk check public/sh/install.sh public/checksum.txt
• git diff --check

Closes #215

[cloudflare-workers-and-pages]

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