Add SwiftFormat configuration and apply formatting

[Kyle-Ye]

Summary

• Add .swiftformat configuration file tailored to the project's existing code style
• Apply automated formatting to all Swift source files (46 files)
• Add Scripts/format-swift.sh convenience script for formatting changed files
• Update CLAUDE.md with formatting step in development workflow

Key formatting fixes include:

• Trailing whitespace removal
• Import sorting (alphabetical)
• Consistent indentation
• Operator spacing normalization
• Blank line consistency between scopes

The .swiftformat config preserves project conventions by disabling opinionated rules (extensionAccessControl, docComments, opaqueGenericParameters, redundantReturn, etc.) and excludes vendored directories and Package.swift.

Test plan

• Verify swift test passes locally
• Verify CI passes with no build errors
• Spot-check formatted files for correctness

[codecov]

Codecov Report

❌ Patch coverage is 0% with 32 lines in your changes missing coverage. Please review.
✅ Project coverage is 28.84%. Comparing base (0fabe5c) to head (78ef294).

Files with missing lines	Patch %	Lines
...urces/OpenAttributeGraph/Attribute/Rule/Rule.swift	0.00%	19 Missing ⚠️
...urces/OpenAttributeGraphShims/Metadata+Debug.swift	0.00%	9 Missing ⚠️
Sources/OpenAttributeGraph/Runtime/TupleType.swift	0.00%	2 Missing ⚠️
...teGraph/Attribute/RuleContext/AnyRuleContext.swift	0.00%	1 Missing ⚠️
...ibuteGraph/Attribute/RuleContext/RuleContext.swift	0.00%	1 Missing ⚠️

❌ Your patch check has failed because the patch coverage (0.00%) is below the target coverage (70.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@ Coverage Diff @@## main #210 +/- ##
==========================================
- Coverage 29.05% 28.84% -0.22% 
==========================================
Files 70 70 Lines 2550 2562 +12 ==========================================
- Hits 741 739 -2 - Misses 1809 1823 +14 

Flag	Coverage Δ
ubuntu	0.00% <0.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...ributeGraph/Attribute/Attribute/AnyAttribute.swift	0.00% <ø> (ø)
...AttributeGraph/Attribute/Attribute/Attribute.swift	0.00% <ø> (ø)
...ibuteGraph/Attribute/Attribute/PointerOffset.swift	100.00% <ø> (ø)
...ributeGraph/Attribute/Body/ObservedAttribute.swift	0.00% <ø> (ø)
...teGraph/Attribute/Indirect/IndirectAttribute.swift	0.00% <ø> (ø)
...raph/Attribute/Optional/AnyOptionalAttribute.swift	0.00% <ø> (ø)
...teGraph/Attribute/Optional/OptionalAttribute.swift	0.00% <ø> (ø)
...rces/OpenAttributeGraph/Attribute/Rule/Focus.swift	0.00% <ø> (ø)
...enAttributeGraph/Attribute/Rule/StatefulRule.swift	0.00% <ø> (ø)
...nAttributeGraph/Attribute/Weak/WeakAttribute.swift	0.00% <ø> (ø)
... and 10 more

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[augmentcode]

🤖 Augment PR Summary

Summary: This PR introduces a project-wide SwiftFormat setup and reapplies formatting across the Swift codebase.

Changes:

• Adds a new .swiftformat configuration aligned with the repo’s existing conventions (and disables more opinionated rules).
• Runs SwiftFormat across ~47 Swift source/test files to normalize whitespace, indentation, and line wrapping.
• Standardizes import ordering and operator/range spacing.
• Applies small mechanical modernizations produced by the formatter (e.g., shorthand optional binding, consistent function signature wrapping).
• Excludes vendored/generated paths and Package.swift from formatting.

Technical Notes: No behavioral changes appear intended; the diff is predominantly formatting and syntactic normalization to reduce future churn.

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[augmentcode]

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