v0.5.0

Changelog

• 3344462 fix: hook panic can't leak a transaction; package docs; docs match implementation; audit test gaps closed
• 86ead17 perf: bounded SQL cache, plan-time pointer codecs, cached upsert render, CRUD alloc budget met and asserted
• aa90229 fix: compiled placeholder audit covers every clause; fragment-level arity; First honors caller Limit; copy-on-write rebind
• 70449cb fix: preload/relwrite honesty — locked probe, key-family check, real field names, data-free validation, chunking, HasOne arity
• 9514005 fix: conflict updates respect omitzero, refresh updated_at; times normalize in place; MySQL DoNothing drops the row alias
• 75d7df6 fix: plan-time guards — ID convention, interface fields, softdelete column, embedding shadowing, unexported embeds
• df716c3 wip: audit-time snapshot (uncommitted round-5 work as audited)