Fix README Match section to match implementation

[claude]

Summary

• Replace stale description of "literal name nodes" with "is named" edges — the code actually seeds entity-entity confidence directly from Soft TF-IDF name similarity before the propagation loop
• Remove reference to a 0.5 confidence gate that doesn't exist — the code skips neighbor pairs with zero confidence (<= 0.0), not 0.5

Closes #12

Test plan

• Verified updated text matches match.py lines 229-242 (name similarity seeding) and line 259 (<= 0.0 check)
• Confirmed remaining Match section content (exponential sum, functionality, relation embeddings, dangling entities) is still accurate

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