feat: clarify Sopify workflow and add product pages

[Li-Sanze]

Summary

• Clarify the responsibilities and output contracts of Sopify's bilingual Skills.
• Make read-only consultation explicit without adding a second intent or state model.
• Add optional EvidentLoop installation with clear prerequisite, reuse, and recovery behavior.
• Add bilingual static product pages and refresh the workflow, product-form, and architecture visuals.
• Keep the implementation and audit follow-up minimal: no new frontend framework, routing layer, or runtime dependency.

Release candidate

• Version: 2026-07-21
• Delivery: 8b5e2dd
• Audit follow-up: e2d5fa6
• Release metadata: 455eb4b
• GitHub Pages is prepared in the repository but is not enabled by this PR.

Validation

• Release preflight: passed
• Full test suite: 280 passed, 71 subtests passed
• PR CI for 455eb4b: passed
• Scoped Ruff checks: passed
• Desktop and 375px responsive checks: passed without horizontal overflow
• SVG XML, marker, semantic geometry, composition, and browser rendering checks: passed
• EvidentLoop findings: resolved and re-verified

Scope

This change reuses the existing consult_readonly action, host adapters, protocol, writer, installer, and repository assets. It does not add an intent detector, evaluation platform, illustration system, frontend build chain, or new workflow layer.

Merge plan

• Base: main
• Merge method: squash
• Release, Pages enablement, and explicit ~go finalize follow only after the merged main commit is verified.