chore(release): 0.36.0

[astrapi69]

Summary

Release 0.36.0 ships engine#242 (#243): schema 1.19 adds case_sensitive to free_text (boolean, default false).

• E-FREETEXT-DISJOINT compares without case unless an exercise declares the field.
• The QTI adapter carries the flag as caseSensitive.

A lesson that passed 0.35.0 can now fail. Measured over the 632 lessons of the eleven content repositories, exactly two exercises do: the two that teach capitalisation in adaptive-learner-content. They declare the field with the hub's re-pin.

Docs audit

I checked every doc for the release's change: case claims, free_text rules, QTI mapping, schema version, package version and counts.

Doc	Result
README.md	#243: schema v1.19. The one other "case" mention (isKnownContentDomain) is about domain values, unaffected.
CONTRIBUTING.md	Checked, nothing affected.
CHANGELOG.md	#243: the entry. This PR: the dated 0.36.0 section with its intro.
docs/lesson-format.md	#243: the free_text section, catalog and params rows, the x-schema-version note for v1.19.
docs/validation.md, docs/qti.md	#243: the free_text row, and the QTI mapping and round-trip rows.
docs/concepts.md	#243: v1.19 in the version history and the current version.
docs/architecture.md	#243: the #237 item points to #242, plus a new #242 item (engine side done, downstream open).
docs/comparative-analysis.md	#243: schema 1.19. This PR: package 0.36.0 in three places, and the re-measured test count (1,774).
docs/schema-diagrams.md	#243: regenerated (version comment).
docs/getting-started.md, authoring-patterns.md, extensions.md	Checked, nothing affected. None states how case is graded.
docs/blog/*.md + docs/blog/de/*.md	#243: the current schema version in three articles per language. No article claims anything about case.
docs/proposals/*.md	Checked, nothing affected.
In-code docs	checkFreeTextDisjoint and the QTI mapping have docstrings. The schema descriptions of accept, distractors and case_sensitive are updated. npm run docs:api:check passes.

Downstream

The order follows docs/architecture.md:

1. App: re-pin, and grade in case where an exercise declares it. A case difference must not pass as a tolerated typo. The backend models forbid unknown fields, so the app goes first.
2. Hub: pin 0.36.0 plus case_sensitive: true on the two exercises, in one PR.
3. Template and fleet: pin 0.36.0 and refresh the mirror (schema 1.19). The template's LESSON-FORMAT gets the field.

Gates

All pass:

• make release-check: 1774 tests;
• make prose-check;
• npm run docs:api:check.

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