T3: Create PATTERNS hash with Pattern class

[dpaluy]

Task Details

Priority: p1 | Story Points: 3 | Group: A (Foundation)
Depends on: none

Files

• lib/tracebook/redactors/patterns.rb
• test/lib/redactors/patterns_test.rb

Acceptance Criteria

• PATTERNS hash with 16 patterns (email, phone, credit_card, ssn, API keys, private_key, IPs)
• Pattern class with call(text, audit:) interface
• Validator integration for credit_card and ssn patterns
• Unit tests for each pattern

Context

Part of PII Redaction Architecture Refactor - Phase 2: Pattern System

See full plan: docs/plans/260106-02b-pii-redaction-architecture.md