# PLAN

Current outcome: make Hemx internals easier to change without altering public behavior, generated contracts, diagnostics, or portability.

## HMX-M01 — Isolate template authoring validation

Outcome: template authoring validation is privately owned without public, diagnostic, ordering, or fingerprint drift.
Delta: architecture/001 assurance/001
Checks: `cargo test -p hemx-build`; focused contract/fingerprint/diagnostic checks; Redgate; diff check; fresh-context review.
State: Done
Blocked by: none

## HMX-M02 — Isolate Rust source fact extraction


Outcome: `hemx-build` Rust/syn fact collection has one private owner independent of template validation and emission.
Delta: architecture/002 assurance/001
Path: application Rust source -> syntax facts -> generated component/form/handler contract -> deterministic artifact.
Build: move the whole fact model, syn traversal, and related tests together; retain the existing host-only dependency boundary.
Risk: reordered facts or changed path handling alters generated contracts or fingerprints.
Checks: `cargo test -p hemx-build`; generated-contract semantic and fingerprint fixtures; Wasm target tree gate; `redgate check`.
Non-goals: replacing syn, changing generated vocabulary, or introducing a generic analysis framework.
Residual risk: overlaps `hemx-build/src/lib.rs`; implement after HMX-M01 to avoid conflicting movement.
State: Draft
Blocked by: HMX-M01

## HMX-M03 — Isolate artifact emission and diagnostics


Outcome: generated Rust, metadata, lowering tables, and contract diagnostics are emitted through one private boundary behind the public builder.
Delta: architecture/003 assurance/001
Path: validated template and Rust facts -> stable IDs/metadata -> generated files -> downstream compilation diagnostics.
Build: move artifact assembly and diagnostic formatting as one responsibility; keep public entry points and no-op write behavior in place.
Risk: byte, ordering, fingerprint, or diagnostic drift breaks downstream builds despite compiling locally.
Checks: `cargo test -p hemx-build`; exact generated API/diagnostic/fingerprint fixtures; no-op rewrite check; package archive checks; `redgate check`.
Non-goals: a new IR, new serialization, public API changes, or formatting-only rewrites.
Residual risk: this is the broadest movement slice and requires fresh-context review after integrated proof.
State: Draft
Blocked by: HMX-M02

## HMX-M04 — Localize Axum interaction forms


Outcome: media-type enforcement, body limits, URL-encoded/multipart extraction, typed decoding, and rejections have one private Axum owner.
Delta: architecture/004 assurance/002
Path: HTTP request -> `InteractionRequest` extraction -> typed `Form<T>` or custom multipart model -> registered handler/rejection.
Build: move the complete form boundary with its tests; add compile coverage for documented `Form<T>` spellings and custom `FromInteractionForm` extraction.
Risk: extraction order, limits, rejection status/body, or public adapter signatures change.
Checks: `cargo test -p hemx-axum`; `cargo test -p hemx-derive`; focused URL-encoded, multipart, limit, rejection, and compile-pass/fail assertions; `redgate check`.
Non-goals: framework-owned CSRF/auth policy, a general extractor abstraction, or changing native form semantics.
Residual risk: none beyond the existing application-owned security policy boundary after focused route proof.
State: Ready
Blocked by: none

## Closure

Run all repository-required Redgate, fmt, clippy, workspace test, license, Wasm graph, and package archive gates. Finish with a fresh-context blocker-only review against INTENT.tsv, SPEC.tsv, this plan, the actual diff, and proof outputs. Keep `hemx-core`, `hemx-js`, `hemx-derive`, and public package boundaries cohesive unless a later validated responsibility seam requires change.