Kingfisher v1.104.0

[v1.104.0]

• Compiled Vectorscan rule caching is now enabled by default, with --no-rule-cache available for opt-out and --rule-cache-dir / KF_RULE_CACHE_DIR for custom or Docker-mounted cache locations.
• Cache entries are keyed so built-in and external --rules-path rule changes refresh automatically; stale, corrupt, unreadable, or unwritable cache entries fall back to normal compilation without failing the scan.
• Added INFO logging for the cache location in use, plus kingfisher rules compile-cache for prebuilding the cache explicitly.
• Added opt-in rule cache pruning via --prune-rule-cache and kingfisher rules prune-cache, with entry-count and age thresholds.