Fix getSpecFromDir to handle auto-generated packages without recipe separator

[Copilot]

The getSpecFromDir function in bits_helpers/utilities.py was failing when processing auto-generated packages that only return a YAML header without the --- recipe separator.

Problem

Auto-generated packages created through the GeneratedPackage class may only return header content (YAML metadata) without a recipe body. The getSpecFromDir function assumed all package content follows the format:

package: name
version: 1.0
---
recipe content here

When auto-generated packages returned only:

package: name  
version: 1.0

The function would fail with: ValueError: not enough values to unpack (expected 2, got 1)

Solution

Modified getSpecFromDir to handle both cases:

# Before (would fail):
header, recipe = d.split("---", 1)

# After (handles both cases):
if "---" in d:
    header, recipe = d.split("---", 1)  
else:
    header = d
    recipe = ""

This allows auto-generated packages to work properly with the from inheritance feature while maintaining full backward compatibility.

Example

With this fix, auto-generated packages can now be used in inheritance scenarios:

# Override spec inheriting from auto-generated package
package: mypackage
from: autogen  # References auto-generated package directory
version: v2.0  # Override auto-generated version

The auto-generated package provides the base specification, and the override spec can modify or extend it as needed.

Testing

• Added comprehensive unit tests for both auto-generated packages with and without separators
• Verified backward compatibility with existing regular packages
• Tested edge cases (multiple separators, empty content, etc.)
• All existing functionality remains intact

Additional Changes

• Fixed regex syntax warning by using raw string for the pattern in resolve_spec_data

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