v11.0

v11.0 Query Builder

Delivered: Expanded the Mesh ORM with comprehensive query builder capabilities (JOINs, aggregations, upserts, advanced WHERE, raw SQL fragments, RETURNING, subqueries) and rewrote all 68+ Mesher raw SQL data queries to use the ORM, verified end-to-end.

Key accomplishments:
- Advanced WHERE operators and raw SQL fragments with $N renumbering
- JOIN support (inner/left/aliased/multi-table) and full aggregation suite (count/sum/avg/min/max, group_by, having)
- Upsert (INSERT ON CONFLICT), RETURNING clause, subquery WHERE IN; type checker + service loop bugs fixed
- 49+ Mesher queries rewritten to ORM; 18 intentional ORM boundaries documented; zero unaccounted raw SQL
- Mesher compiled zero errors; all 8 HTTP API domains 2xx, WebSocket 101, SIGSEGV resolved
- 32/32 requirements satisfied

See .planning/MILESTONES.md for full details.