[Jammy2211]

Align chapter summaries and current-course navigation with the six-lesson pixelization chapter. Regenerate notebooks with corrected Lens assistant guidance, including the restored Fit Problems and combined adaptive reconstruction lessons.

Part of #127.

Scripts Changed

No executable script source changes; documentation, routing and generated guidance only.

Validation checklist

• Canonical notebook generation; source narrative/executable parity and notebook inventory checked.
• Navigator checks, deterministic catalogue regeneration and whitespace checks.
• Current course destinations and semantic routing audited across 52 ecosystem repositories, with explicit proposed overlays for three claimed owners.
• Independent source review.
• Smoke: n/a under AUTONOMY.md docs-only applicability; executable notebook code is unchanged.
• Heart: latest readiness is STALE solely because no release rehearsal exists for current source. This is a development PR, not a release.

Dependencies and scope

Merge PyAutoLabs/autolens_assistant#178 first so future notebook generation preserves this guidance. That canonical source is now applied in a separate documentation-only worktree under the user's explicit claim exception; the other tasks' claims and changes remain intact. No library API dependency is introduced.

Canonical assistant validation: full suite passes in its required pinned environment (305 passed, 3 skipped, 1 expected failure); focused metadata/context tests pass and regeneration is idempotent. All Lens consumer contexts match that source exactly.

Merge remains human /prm; no automatic merge.