Add AGENTS.md bootstrap option to pm new

[ktabouguia-sq]

Why

Make it easier to bootstrap new pm project directories with agent instructions when the caller wants them.

What

• Add pm new --agents-md [PATH] with ./AGENTS.md as the no-value default
• Copy the selected agent instructions into the project root and symlink CLAUDE.md to AGENTS.md
• Add integration coverage for omitted, explicit-path, default-path, and missing-file behavior

Risk Assessment

Low — this only affects pm new when the new option is supplied; existing calls without --agents-md keep skipping agent files.

References

• Verified with cargo test -p pm
• Verified with cargo clippy --workspace -- -D warnings
• Verified with cargo fmt --all --check
• Verified with cargo test --workspace
• Pre-push passed crates fmt/lint/test plus staged and differ CI

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[ktabouguia-sq]

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[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: 6120e2a0a0

ℹ️ About Codex in GitHub

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• Comment "@codex review".

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