chore(release): 0.34.0

[astrapi69]

Summary

Release 0.34.0 ships engine#220 part 1 (#225): the engine evaluates parametric exercises through two new functions, resolveExerciseVariables and evaluateExpression.

There is no schema change (1.18) and no new rule, so nothing a consumer validates changes.

Docs audit

I checked every doc for the release's change: "never evaluates" claims, the Variables contract, the new exports, the package version and the counts.

Doc	Result
README.md	#225: API rows for both functions and the two types.
CONTRIBUTING.md	Checked, nothing affected.
CHANGELOG.md	This PR: the dated 0.34.0 section.
docs/lesson-format.md	#225: the Variables section describes the resolver and drops "never samples or evaluates".
docs/architecture.md	#225: open item for #220 (part 1 done, part 2 waits for a consumer).
docs/comparative-analysis.md	#225: §6.3, where the engine now evaluates. This PR: package 0.34.0 in three places and the re-measured test count (1,703).
docs/validation.md, concepts.md, getting-started.md, authoring-patterns.md, extensions.md, qti.md, schema-diagrams.md	Checked, nothing affected. There is no "never evaluates" claim in them.
docs/blog/*.md + docs/blog/de/*.md	#225: "did we reinvent the wheel" (en and de) has a dated update note on its "never evaluates anything" sentence. The other articles have no such claim.
docs/proposals/*.md	Checked, nothing affected.
In-code docs	The variables.ts module docstring now says the engine evaluates. There are docstrings on resolve-variables.ts and evaluateExpression. npm run docs:api:check passes.

Downstream

• App: replace resolve-exercise-variables.ts with the engine's resolveExerciseVariables. The contract is the same, and the app's tests pass against the engine.
• Content repos: nothing to do; no re-pin is needed for this release alone.

Gates

make release-check, make prose-check, npm run docs:api:check and scripts/check-bundle-size.mjs all pass (core 88.1 of 90 kB gzip).

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