re0-tutorial

1Advance a human-chosen exercise through three levels, grade the learner's submitted work, and append a private attempt record.
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3## Goal
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5Teach 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.
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7## Workflow
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91. 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.
102. 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.
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