re0-tutorial

Advance a human-chosen exercise through three levels, grade the learner's submitted work, and append a private attempt record.

Goal

Teach one skill's best practice, reasoning about combinations, and application to a real problem, in that order. Completion means only that the submitted exercise meets its contract. Human completion and transfer remain unmeasured; neither a simulated learner nor an invocation trace measures learning.

Workflow

1. Start only on human invocation. Agree on a target, level, and exercise identifier. Read the installed target skills and their contracts, including Verification. Choose skills for what they teach, without preferring an invocation lane. State the required submission and grading criteria before the learner begins.
2. Define the level using the table below. Explain the task and its trigger without performing the learner's steps, producing their submission, or supplying the L3 combination. Wait for the learner's work.
3. On resume, from this skill's folder run node scripts/attempt.mjs --exercise <id> --skills <skill folders...> [--json] with the exercise's skill folders. It digests them with line endings normalized, reads the exercise's records under .re0/tutorial/<exercise>/, compares the latest with the current installation, and prints a status (fresh, match, version-only, content-difference, stale or unreadable) with the next unused attempt path. Exit codes: 0 fresh, match or version-only, 3 content-difference or stale, 4 unreadable, 2 a usage error, which is a broken run: fix the command and run again. Apply the resume rules below to that status; do not silently substitute a renamed dependency.
4. Check that the submission is present and establish authorship, then grade against the level's criteria. Record the decisive evidence and reason. An invocation, actor label, or host trace supplies context only; it cannot establish learner performance or settle ambiguous authorship.
5. Write one new, immutable attempt record at the next path step 3 printed (.re0/tutorial/<exercise>/<version>-<attempt>.local.md); the script prints that path for a first attempt too. Report the grade, any clarification needed, and the record path. Only a completed grade earns an exercise-completion badge.