fix(references): keep non-Latin reference labels

[lfazliev]

What

clean_label rejected any reference label without an ASCII alphanumeric
character ([A-Za-z0-9]), so Cyrillic and other non-Latin profile names —
common in RU/BY and other locales' people-search results — were silently
dropped. Relax the guard to the Unicode word-character check [^\W_]: a label
is kept when it has at least one letter or digit in any script, while pure
punctuation/symbol labels are still rejected.

Tests

• test_keeps_cyrillic_only_names — a Cyrillic-only name survives cleaning.
• test_rejects_punctuation_only_labels_across_scripts — punctuation-only
  labels are still dropped.

Synthetic prompt

In link_metadata.clean_label, the [A-Za-z0-9] guard drops valid non-Latin
(e.g. Cyrillic) profile names. Relax it to a Unicode word-character check so
any-script letters/digits pass while punctuation-only labels stay rejected.
Add regression tests.

[greptile-apps]

Greptile Summary

This PR keeps non-Latin reference labels during link metadata cleanup. The main changes are:

• Uses a Unicode letter-or-digit check in clean_label.
• Preserves Cyrillic-only profile names in scraped references.
• Adds tests for Cyrillic labels and punctuation-only fallback behavior.

Confidence Score: 5/5

This looks safe to merge.

• No blocking issues found in the changed code.

Important Files Changed

Filename	Overview
linkedin_mcp_server/scraping/link_metadata.py	Changes the final label-content guard from ASCII-only matching to a Unicode letter-or-digit check while keeping punctuation-only labels rejected.
tests/test_link_metadata.py	Adds tests for preserving Cyrillic-only names and falling back from punctuation-only visible text to aria_label.

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