Upgrade the integration crate and examples to Axum 0.8 and use the native async extractor traits while preserving hemx routing, request, runtime, and effect behavior.
req: axum/002
Expose and use InteractionHandlers in the beginner example so the normal path reads as app handlers instead of registry plumbing while preserving the integration registry API.
req: ceremony/005
Add state_interactions as a small helper for app-owned stateful registries, and use it in the workout exemplar to remove one layer of repetitive route wiring without hiding generated handles or app handlers.
req: axum_integration/003
req: ceremony/001
req: dx/003
req: codegen/002
req: examples/001
Generate a SHA-256 content hash for the embedded hemx runtime, expose the hashed path from hemx-axum, serve immutable runtime headers, and update examples to load the hemx-owned path instead of fixed /hemx.js URLs.
req: axum_integration/005
Close the fallible handler and example coherence slice: v0 uses typed todo newtypes, Result handler failure mapping, generated form/partial helpers, and page composition; kanban is explicitly marked as an advanced north-star milestone; raw render is isolated behind hemx::advanced::render.
req: canonical_authoring/003
req: failure/004
req: public_api/005
req: examples/004
slhx agent