Amp heuristics

[tommens]

The, previously correct, heuristic of the Amp tool to use AGENT.md files has changed in May 2025 according to
https://ampcode.com/news/AGENT.md

They now use AGENTS.md instead to be compatible with the emerging convention.

[rrobbes]

Thanks for the report, Tom! This could be handled by dates. I'll leave a note in the Amp heuristics for now.

In any case, the "generics" heuristic catches this.