[mattsenicksigma]

Summary

• `simple_dashboard` always emitted a title block (title, subtitle, rule). Adds `show_title=true` (default, so existing reports are unchanged); `show_title=false` starts the page straight at the KPIs/charts. The report is still named `name`.
• Documented in `macros/schema.yml` and the README; new `sigma_sales_untitled` integration model, golden file and assertion.

Test plan

• `UPDATE_GOLDEN=1 PARSE_FLAGS=--warn-error bash scripts/run_integration_tests_duckdb.sh` on dbt 1.12.5 / dbt-duckdb 1.11.0: all pass; only new golden is `sigma_sales_untitled.json`
• dbt 2.x CI

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