R13 — Explicit floors and ceilings for dbt-core, dbt-adapters, dbt-common, confluent-sql, with a CI matrix

**Today:** Pins are `dbt-core~=1.11` / `dbt-adapters~=1.16`; both permit versions that break (1.12 installed breaks; adapters 1.24.5 installed).

**Acceptance:** Supported range tested; 1.12 either works or is excluded by the pin.

**Status (9/9/2026):** Not Done.

From `v1.md` (derived from INIT-4769 PRD §6 Requirements), Version 1.0 epic.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Start by locating the dependency declarations and CI configuration for dbt-core, dbt-adapters, dbt-common, and confluent-sql. Determine the supported version range from the existing pins, then run or extend the CI matrix to test that range, including dbt 1.12. Done means supported versions pass or incompatible versions are explicitly excluded.

Written by the indexing model from the issue text.