feat: builder prompt rewrite + dbt skills consolidation + altimate-dbt CLI

[suryaiyer95]

Summary

• Rewrite builder.txt from flat tool list to skills-first architecture with altimate_core offline SQL analysis tools surfaced
• Add altimate-dbt CLI (packages/dbt-tools/) — 16 commands wrapping @altimateai/dbt-integration for one-shot dbt operations
• Consolidate 8 dbt skills into 5 with progressive references/ system for lean AI routing
• Fix dbt-tools CLI error handling in columns, init, and main dispatch

Changes

Builder Prompt (packages/opencode/src/altimate/prompts/builder.txt)

• Skills-first architecture: organized tables for dbt (5), SQL (3), Training (3) skills
• Surface 6 altimate_core tools (validate, semantics, lint, column_lineage, correct, grade) — previously invisible to the agent
• Structured 5-phase workflow: Explore → Plan → Analyze → Execute → Validate
• Common Pitfalls section from benchmark failure analysis
• Removed verbose pre-execution protocol and FinOps tools

altimate-dbt CLI (packages/dbt-tools/)

• 16 commands: init, doctor, info, compile, build, run, test, execute, columns, graph, deps, etc.
• Config at ~/.altimate-code/dbt.json, auto-detected via altimate-dbt init
• JSON output to stdout, logs to stderr
• Python bridge fix for altimate_python_packages bundling

Skills Consolidation (.opencode/skills/)

• New: dbt-develop, dbt-test, dbt-troubleshoot, dbt-analyze, dbt-docs (5 focused skills)
• Deleted: dbt-cli, model-scaffold, generate-tests, yaml-config, incremental-logic, medallion-patterns, impact-analysis (7 merged)
• Each skill has lean SKILL.md + references/ directory for progressive context

Test plan

• Verify altimate-dbt init detects dbt project and creates config
• Verify altimate-dbt build --model <name> compiles and runs models
• Verify builder agent uses skills (dbt-develop, dbt-troubleshoot) when appropriate
• Verify altimate_core_* tools appear in agent's tool list
• Run Spider2-DBT benchmark to compare pass rate vs main

🤖 Generated with Claude Code