v0.9.6

Added

• docs/blueprint.md: a standard app architecture for building on fascicle — one composition layer, three adoption tiers, markdown prompts, normalized module shapes, stub-engine testing, and field-observed anti-patterns distilled from the example apps and production consumers.
• Three ast-grep boundary rules wired into examples/pr-improve (runnable via check:rules): create_engine confined to engine.ts, no imperative loops in flow.ts, and fascicle value imports confined to the files allowed to know about it.