cuda_pathfinder: confirm intended behavior for Linux .so glob fallback

[cpcloud]

Follow-up to PR review discussion: #1693 (comment)

Goal

Confirm whether the current Linux fallback behavior is the intended behavior, and ensure code/tests/docs reflect that intent.

Current behavior (as implemented)

In cuda_pathfinder/cuda/pathfinder/_dynamic_libs/search_platform.py:

• First try exact lib<name>.so.
• If not found, glob lib<name>.so*.
• Sort matches and return the first one.

Question to resolve

When multiple versioned matches exist (for example libcupti.so.12 and libcupti.so.13), is the current selection behavior the one we want?

What this issue tracks

• Find and link any existing policy/precedent (code comments, prior PRs/issues, docs).
• Confirm whether current implementation matches intended behavior.
• If yes: add/adjust tests/comments as needed to make that intent explicit.
• If no: open/track a follow-up implementation change.

[cpcloud]

Preference noted for decision: if Linux glob fallback (lib<name>.so*) yields multiple candidates, raise an explicit ambiguity error listing matches, rather than selecting a candidate by ordering heuristic. This avoids silently choosing a potentially unintended ABI/version.