Rename --workflow-dir to --workflows-dir

[Copilot]

This PR renames the --workflow-dir flag to --workflows-dir to better reflect that it specifies a directory containing multiple workflows (plural form).

Changes Made

• CLI Flag: Updated flag definition from workflow-dir to workflows-dir in the compile command
• Help Text: Updated examples and flag description to use the new name
• Error Messages: Updated validation error messages to reference workflows-dir
• Tests: Updated all test cases and assertions to use the new flag name
• Makefile: Updated the recompile command to use --workflows-dir

Before

gh aw compile --workflow-dir custom/workflows

After

gh aw compile --workflows-dir custom/workflows

The old flag is no longer supported and will return an "unknown flag" error, ensuring users migrate to the new naming convention. All functionality remains identical - only the flag name has changed for better clarity.

Verification

• ✅ All existing tests pass
• ✅ CLI help displays the new flag correctly
• ✅ Old flag is properly rejected
• ✅ Error messages use the new flag name
• ✅ Makefile commands work with new flag

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:

• api.contoso.com
  • Triggering command: /tmp/go-build3131781709/b279/cli.test -test.testlogfile=/tmp/go-build3131781709/b279/testlog.txt -test.paniconexit0 -test.timeout=10m0s -test.v=true (dns block)
  • Triggering command: /tmp/go-build2231786246/b279/cli.test -test.testlogfile=/tmp/go-build2231786246/b279/testlog.txt -test.paniconexit0 -test.timeout=10m0s -test.v=true (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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