Skip AGENTS.md in replacePlaceholder to preserve comet-starter URLs

[Copilot]

When npx @comet/create-app scaffolds a new project, it replaces all occurrences of starter/Starter with the project name. AGENTS.md contains hardcoded GitHub URLs referencing comet-starter in its References section — these are correctly pointing at the template repo and must not be replaced.

Change

• create-app/src/util/replacePlaceholder.ts: Add an early-return guard for AGENTS.md, skipping it entirely from placeholder substitution — consistent with the existing special-case handling for intl-update.sh.

if (file.endsWith("AGENTS.md")) {
    return;
}

Without this, URLs like https://api.github.com/repos/vivid-planet/comet-starter/contents/{path} would be rewritten to use the project name, breaking all starter repo references in AI agent guidance.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• iojs.org
  • Triggering command: /usr/bin/curl curl -q --fail --compressed -L -s REDACTED -o - (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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[dkarnutsch]

@thomasdax98 @johnnyomair I'm not really happy with the solution. What do you think?

[johnnyomair]

@thomasdax98 @johnnyomair I'm not really happy with the solution. What do you think?

Why? Because of generally excluding AGENTS.md? If yes, an alternative would be to change the placeholder regex to not replace starter if it's part of https://github.com/vivid-planet/comet-starter.