Add MySQL database adapter and shared pool mode via `USE` switching#1

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QuirkQ wants to merge 14 commits intomainfrom

feat/mysql-database-adapter-USE

Commits on Feb 23, 2026

Add MySQL database adapter for activerecord-tenanted
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Add shared pool error classes and config predicates
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Route tenant pool lookups through physical shard key
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Add SharedPool adapter module with checkout/checkin lifecycle
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Wire tenant context switching and Railtie adapter hooks
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Fix shared pool callback crash on temporary connections and tenant creation race condition
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Query cache namespace bypass on pinned cross-thread path
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Fix MySQL 64-char DB name guard to account for test worker suffix
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Narrow MySQL discovery rescues and standardize logging across the gem
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Fix four bugs in activerecord-tenanted's MySQL adapter and config layer
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Fix host template enumeration conflict and add early shared-pool validation
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Restore fail-fast on mistyped template tokens in database and host templates
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Cap advisory lock names to MySQL's 64-character limit
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Allow omitted prepared_statements in shared-pool validation
QuirkQ
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