v7/v4 major cycle: remove render-once transition compatibility layers

[markdumay]

Tracking issue for the major-bound removals parked from the render-once program (2026-07-16/17). Each item below breaks a documented compatibility contract, and a Hugo-module major changes the import path (…/v6 → …/v7), cascading through every dependent module's go.mod + config imports and every site — plan as a coordinated wave (the v6 generation required a 12-module wave program).

mod-utils v7

• Drop the dependencies Scratch dual-write in utilities/AddModule.html — write to .Store only. Precondition: consumers read Store (hinode ≥ v3.5.x reads the Scratch∪Store union in head/head.html + footer/scripts.html, so hinode needs no change; third-party themes reading Scratch.Get "dependencies" break — release note).
• Remove the purgeHTMLComments branch from utilities/ProcessContent.html (deprecated with a gated LogWarn since v6.6.2). Release note: use ignoreLogs = ['warning-goldmark-raw-html'] (hinode's exampleSite has done so since the render-once flip).
• Escalate omitted page arguments from warn to error in AddModule. Precondition sweep BEFORE the major: verify every in-org caller threads page (mod-leaflet and mod-lottie were never audited for AddModule/UniqueID threading — audit and thread in minors first). Also make the deprecation warnings unconditional (drop the transitional debugging.showDeprecations gate introduced in v6.6.0).

mod-fontawesome v7

• Drop the icons Scratch dual-write in assets/icon.html — .Store "hinode-icons" only — and drop the Scratch side of the union read in assets/symbols.html. Same third-party-theme caveat.

hinode v4 (companion items, same cycle)

• Global-page fallbacks → error in the partials that gained page args during the render-once program (image, section-title, card, button, card-icon, form-hook, …): remove the warn-missing-page-argument fallback path once the mod-utils escalation lands.
• Adopt mod-utils v7 / mod-fontawesome v7 import paths; drop the transitional Scratch∪Store union reads (Store-only) in head/head.html and footer/scripts.html.

Cascade inventory (verify against current go.mods at execution time)

Modules importing mod-utils (path bump required): hinode, mod-blocks, mod-fontawesome, mod-flexsearch, mod-docs, mod-mermaid, mod-leaflet, mod-lottie, mod-cookieyes, mod-csp, mod-bootstrap-icons, mod-katex (+ gethinode.com and demo sites). Sequence module-first with dual-path grace where feasible.

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Full context: render-once program register + 2026-07-17-v7-major-checklist.md (private gethinode.com repo, branch program/render-once-implementation).

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