Glob Pattern Matching for Subscriptions

[jwilger]

Overview

Implements POSIX glob pattern matching for SubscriptionQuery per ADR-017 and ARCHITECTURE.md v1.6. Enables filtering subscriptions using wildcard patterns like account-* or order-[0-9]*.

Core Components

• StreamPattern type that permits glob metacharacters (*, ?, [, ])
• SubscriptionQuery::filter_stream_pattern(StreamPattern) method
• POSIX glob matching via glob crate (or similar)

Design Decisions (from ARCHITECTURE.md)

• Distinct type: StreamPattern vs StreamPrefix (literals) - type system makes intent explicit
• Reserved characters in StreamId/StreamPrefix enable unambiguous pattern matching
• POSIX glob over regex: simpler, sufficient, safer (no catastrophic backtracking)

Acceptance Criteria

• StreamPattern type created with wildcard support
• Single-character wildcard (?) works correctly
• Character class ([0-9]) works correctly
• StreamPattern distinct from StreamPrefix (glob chars forbidden in prefix)
• Subscription filtering with patterns works for InMemoryEventStore
• Subscription filtering with patterns works for PostgresEventStore

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Migrated from beads issue: eventcore-ihm