Gentle-ramp the first exercises of each topic

[abhiksark]

Part of the 0.3.0 adoption roadmap — Curriculum (beginner ramp).

Why (adoption impact)

Beginners bounce if the early exercises are too steep. The first 1–3 exercises of each topic should be confidence-builders. This issue audits and gently smooths those on-ramps.

Current state

• 292 exercises across 31 topics (exercises/, ordered via info.toml).
• A gap-audit methodology is already specced in docs/superpowers/specs/2026-06-02-gap-audit-design.md — its difficulty-curve checks are the tool for this issue.

Scope / acceptance criteria

• For each topic, review the first 1–3 exercises for "gentle start": single new concept, minimal prerequisites, short.
• Flag any topic whose opener jumps in difficulty (multiple new concepts at once, long, depends on un-taught material).
• Propose concrete fixes (reorder, simplify, or insert a gentler intro exercise) in a checklist here before editing.
• Apply approved fixes keeping exercises/ + checks/ + solutions/ + info.toml in sync, every reference solution passing (tests/integration/test_solution_verify.py).

Where to look

• exercises/<topic>/, info.toml, checks/, solutions/_answers.py.
• docs/superpowers/specs/2026-06-02-gap-audit-design.md (difficulty-signal heuristics).

Out of scope

• Full coverage-gap analysis (that's the separate gap-audit effort); this issue is only the early-ramp of existing topics.

Verify

• python -m pytest -q stays green; manually skim the first exercises of a few topics for gentleness.

Difficulty

help wanted · documentation — curriculum judgment; coordinate proposed changes before editing 31 topics.