feat: scaffold Week 10 assignment - Daily Borough Stats Mart with dbt

[lassebenni]

Summary

• Students build a dbt Core project producing a mart at grain (pickup_borough, pickup_date) for January 2024 NYC Green Taxi data
• Static-analysis autograder (no live DB required in CI) verified end-to-end

Autograder results

Repo	Score	Pass
Bare scaffold	25/100	false
Working solution	100/100	true

Scoring ladder

Score	Gate
10/100	Required files exist (dbt_project.yml, packages.yml, models, tests, reports, AI_ASSIST.md)
25/100	.gitignore excludes profiles.yml; profiles.yml.example uses env_var()
45/100	Staging: source() refs, NULL + negative-fare filters, tip_pct column
65/100	Mart: JOIN to zones, GROUP BY borough+date, 6 required output columns
80/100	Tests: dbt_utils compound uniqueness + not_null YAML + singular test
90/100	Docs: grain stated in model description, column descriptions filled
100/100	reports/answers.md (4 SQL blocks) + AI_ASSIST.md filled

Passing score: 60/100.

Test plan

• Scaffold: 25/100, pass=false
• Solution: 100/100, pass=true
• Grader runs without live DB (static analysis only)
• profiles.yml excluded from .gitignore
• profiles.yml.example uses env_var() references

🤖 Generated with Claude Code

[lassebenni]

Closing in favour of #2. This scaffold pre-filled dbt_project.yml, packages.yml, and the YAML test blocks, which leaks the answers to Task 1 (dbt init) and Task 5 (tests) of the assignment chapter — the chapter's design is that students create those themselves. The TODO-stub SQL and template files from this PR were solid and have been reused in #2, which also adds the missing CI (dbt parse check), devcontainer, and removes the org-template task-N placeholder dirs.