feat: add SameNetTraceCombiningSolver pipeline phase (#29)

[Mira-Mjodheim]

This PR restores and continues the previous attempt #284, which was accidentally closed when the head repository was deleted during fork cleanup.

Implements SameNetTraceCombiningSolver for issue #29.

Scope:

• combines adjacent same-net horizontal trace segments;
• combines adjacent same-net vertical trace segments;
• avoids combining segments from different nets;
• avoids combining segments separated by large gaps;
• includes tests covering same-net merge and non-merge cases.

Validation:

• SameNetTraceCombiningSolver targeted tests pass.
• Full test suite passes after updating expected snapshots for the intentional trace-combining output changes.

Notes:

• Previous PR feat: add SameNetTraceCombiningSolver pipeline phase (#29) #284 was closed unintentionally due to head repository deletion.
• This PR supersedes feat: add SameNetTraceCombiningSolver pipeline phase (#29) #284.

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Project	Deployment	Actions	Updated (UTC)
schematic-trace-solver	Ready	Preview, Comment	May 11, 2026 6:35am