[workshop-sim] Repair: Rename mandatory billing-path page out of the optional side-quest naming pattern

Find the file side-quest-07d-billing-paths.md in the workshop directory and rename it to 07e-choose-billing-path.md. Update its heading and all inbound links from 07d-confirm-model-access.md and any cross-references. Ensure the file is removed from the side-quest listing in workshop/README.md. Verify the content remains unchanged and the links work.

Problem statement

Step 7 (07-your-first-workflow.md) is the highest-dropout step in the corrected Monte Carlo simulation: 21.2% conditional dropout among 22,507 at-risk runs (95% interval 20.7%–21.8%), with copilot-access-missing as the dominant failure category (4,064 of 4,780 total failures at this step). Content inspection shows 07d-confirm-model-access.md correctly requires the learner to "Follow the full setup steps in [Side Quest: Copilot Billing Paths]" before continuing — but that mandatory billing configuration lives on a page named side-quest-07d-billing-paths.md, using the exact "side-quest" naming and link-label convention (Side Quest: ...) that this curriculum uses everywhere else strictly for optional supplementary content. A learner who has learned to treat "Side Quest" links as skippable (a reasonable pattern given 66 genuinely optional side quests elsewhere) is likely to skip this one, leaving Copilot billing/permissions unconfigured and causing Step 8 to fail.

Proposed change

Rename side-quest-07d-billing-paths.md to a non-"side-quest" filename (e.g. 07e-choose-billing-path.md) and update its heading and all inbound links (from 07d-confirm-model-access.md and any cross-references) to read as a required numbered step rather than an optional aside — for example, "Choose a Billing Path" instead of "Side Quest: Copilot Billing Paths." Do not change the page's actual instructional content (Path A/Path B billing setup, engine confirmation, checkpoint) — only its naming/framing so learners correctly perceive it as mandatory.

Failure mode classification

Access barrier (path-clarity/naming ambiguity causes learners to skip a required configuration step, not a conceptual difficulty).

Quantitative guardrail

• Current overall_score for 07-your-first-workflow.md (the step whose checkpoint depends on this page): 6.25/10
• Current overall_score for 07d-confirm-model-access.md: 6.25/10
• Weakest rubric dimension for both: checkpoint_quality at 0.0/10 (rubric-detection artifact, tracked separately)
• Current learning KPI index for these steps: (2.0×6.3 + 2.0×0.0 + 1.5×5.0)/5.5 ≈ 3.66/10
• This is a renaming/labeling change with no content removed, so it should not lower active_learning, scaffolding, or checkpoint_quality for any of the three pages involved, and should raise real-world completion by making the required path unambiguous.

Acceptance criteria

• The shared curriculum quantitative assessment overall_score for 07-your-first-workflow.md and the renamed billing page stays flat or improves after the change
• The learning KPI index for both affected steps stays flat or improves, confirming students who remain in the workshop are still building skills effectively
• All existing billing setup instructions, checkpoints, and the Path A/Path B decision structure are preserved exactly, only the filename/heading/link labels change
• All inbound links to the renamed file (from 07d-confirm-model-access.md and elsewhere) are updated and workshop/README.md's side-quest listing no longer includes this page

Suggested owner

workshop maintainer
Related to #3772

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• expires on Sep 25, 2026, 8:00 AM UTC