Remove unused {dir} parameter from sidecar pattern formatting

[Copilot]

The resolve_sidecar_path() function was passing a dir argument to pattern.format() that no pattern actually used, triggering a surplus argument warning.

Changes:

• Removed dir=str(parent) from the format call in config.py
• Removed {dir} from function docstring and both documentation files

The function already prepends parent directories automatically for relative paths, so this parameter was redundant:

# These patterns work without {dir} - parent is joined automatically
resolve_sidecar_path(Path("src/foo.py"), "{stem}.history.yaml")
# → src/foo.history.yaml

resolve_sidecar_path(Path("src/foo.py"), ".history/{name}.yaml")  
# → src/.history/foo.py.yaml

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[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

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

• astral.sh
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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
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