hemx/PLAN.md

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: Rust/syn context facts are privately owned without generated contract, ordering, fingerprint, or host-boundary drift. Delta: architecture/002 assurance/001 Checks: focused build facts/contracts/fingerprint tests; Wasm graph; Redgate; diff check; fresh review. State: Done Blocked by: none

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: the interaction-form boundary is privately owned without public extraction, decoding, limit, or rejection drift. Delta: architecture/004 assurance/002 Checks: Axum interaction boundary suite; derive Form spelling check; custom multipart typed extraction; Redgate; diff check; fresh review. State: Done 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.