docs: the 0.35.0 round is done; what the engine computes is pure

[astrapi69]

Summary

• docs/architecture.md:

  • engine#237 is closed. The round went in the documented order on 2026-10-01: the app first (adaptive-learner#3529), then the template with the audit's copy gone (adaptive-learner-content-template#96), then the ten repositories.
  • The rule-ownership section now says the app pins 0.35.0.

• README.md, "What this is NOT": checked claim by claim against the code. Each still holds:

  • the domain field with known values plus other (W-DOMAIN-UNKNOWN);
  • the extension tier;
  • the domain repositories linked below;
  • no lessons shipped;
  • no rendering, grading, scheduling, persistence or networking.

  One sentence is added to "not a runtime". Since 0.34.0 the engine resolves a parametric exercise into an instance (resolveExerciseVariables, a pure function over the random source the consumer passes in), and the grading presets are a catalog, not grading code. Without it, "not a runtime" reads as if the engine computed nothing at answer time.

Test plan

• make prose-check: OK.
• src/links.test.ts, readme-exports.test.ts and docs-version-claims.test.ts: 396 passed.

🤖 Generated with Claude Code