[thiagooak]

Summary

Implements the two "cheap items" from #38 (PED-09):

• Chapter recaps: every chapter now ends with a 3-bullet "You can now" recap, naming what the reader can actually do after finishing it. Styled with a new .recap/.recap-label CSS class (a muted top border, distinct from the yellow .try box, since a recap summarizes rather than prompts an action). Applied to 15 of the 16 chapters — index.edn is skipped deliberately, since it's the course's intro/overview page and there's nothing yet to recap.
• Real retraction example: the Time Travel chapter's history section now shows the actual transaction data behind Clefairy's Generation VI type change — a :db/retract and a :db/add in the same transaction, addressed by [:pokemon/number "035"] lookup ref rather than a raw entity id (which isn't stable across runs of the in-memory database). Verified against the live dataset's history via REPL before writing it into the page.

Out of scope, left untouched per prior discussion: the "Where to next" page, the capstone chapter, the transactable-database idea, and everything related to #33/#34/#35 or the still-open #39/PR #50.

Verification

• clojure.edn/read-string over every chapter file — all parse cleanly
• clojure -X:test — 32 tests, 503 assertions, 0 failures, 0 errors (matches baseline, no regressions)
• End-to-end rendering via app.core/chapter-response for querying, time-travel, rules, and pull — confirmed the new markup renders with the recap-label class present, and that db/retract plus the "035" lookup ref appear correctly in the rendered Time Travel page

Closes #38

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