fix(reporting): use host-neutral portable HTML copy

[Cobb04]

Summary

Replace legacy Codex-specific visible text in the shared portable HTML renderer with host-neutral English and Chinese copy. Generated DSH HTML now identifies the format as Portable HTML, and copied fixes direct users to their coding agent rather than Codex.

Why

• Issue/Story: Closes [Bug]: Use host-neutral branding in portable HTML reports #115
• User or maintainer outcome: every supported portable host receives semantically correct shared report branding while Codex remains one valid portable host.

Independent DSH P0 qualification exposed the shared-renderer bug after #112 / #113 completed. This PR does not reopen or rewrite that historical scope.

Traceability and Scope

• Spec/ADR, if applicable: No new spec required; Bug [Bug]: Use host-neutral branding in portable HTML reports #115 is sufficient for this narrow presentation-only correction. The completed [Feature]: Qualify DeepSeek Harness for portable HTML report rendering #112 spec remains unchanged at AC-1 through AC-16.
• Acceptance criteria addressed: host-neutral visible branding and copy; no Codex-directed instruction in non-Codex generated HTML; aligned English/Chinese output; generated HTML regression; Codex and current portable hosts remain valid without per-host renderers.
• Canonical owners changed: scripts/harness-analysis/renderers/html.mjs, scripts/harness-analysis/renderers/html-interactions.mjs, and their focused generated-output/interaction tests.
• Explicit non-goals: no layout redesign, renderer architecture rewrite, schema, routing, capability, publication, artifact, Canvas, Studio, dependency, package, version, timeout, or configuration change.

Change Type

• Feature
• Bug fix
• Tests only
• Documentation/community
• Refactor with no intended behavior change
• Dependency, packaging, or infrastructure

Test and Review Evidence

Check	Result
Literal default npm run check in a clean detached upstream/main worktree with the exact four-file patch, Node 24.15.0/npm 11.12.1	PASS in 198.87s: root 1,543 passed/2 skipped; Harness 167; Harness UI 30; Harness Studio 270; pack verification 587 npm/849 runtime entries
volta run --node 22.20.0 npx vitest run test/reporting/harness-report-render-cli.test.mjs test/reporting/html-report-interactions.test.mjs (npm 10.9.3)	PASS: 2 files, 49 passed, 1 Windows-only skipped
npx vitest run test/reporting/harness-report-render-cli.test.mjs test/reporting/html-report-interactions.test.mjs on Node 24.15.0/npm 11.12.1	PASS: 2 files, 49 passed, 1 Windows-only skipped
Generated validated DSH report.html, English and Chinese	PASS: Portable HTML eyebrow/footer and neutral copy-success payload present; legacy Codex-directed visible strings absent
Existing Grok/Kimi/WorkBuddy/Codex HTML routing control	PASS: generated artifacts share Portable HTML branding and retain valid routes
git diff upstream/main...HEAD --check	PASS
Cobb04 attribution guard before commit, before push, and against the pushed fork range	PASS: one Cobb04-authored commit with the required Codex co-author trailer; GitHub resolves the primary author to Cobb04

Manual or visual evidence: temporary English and Chinese DSH reports were generated and passed the self-contained HTML validator. Direct in-app visual capture from file:// was attempted but blocked by the browser's local-file security policy; no bypass or screenshot artifact was used. Generated-output tests exercise header, footer, copy-success text, both locales, non-Codex controls, and Codex validity.

Risk and Recovery

• Compatibility and cross-platform impact: visible wording changes intentionally for every portable HTML host; no filesystem or platform behavior changes.
• Package, plugin, schema, or generated-file impact: none. Existing package contents were verified unchanged apart from the two renderer source files.
• Rollback or recovery path: revert commit 7e82ca3.
• Residual risk or unverified boundary: direct local-file screenshot capture is unavailable under the browser security policy; deterministic generated HTML and interaction coverage passed on Node 22 and 24.

AI Involvement

• Level: Assisted
• Human review and validation: Cobb04 owns the contribution, directed the independent traceability correction and delivery requirements, and required Issue-first ownership, exact-patch validation, cross-version coverage, skeptical diff review, and attribution verification. AI assistance covered diagnosis, implementation, tests, source/duplicate audit, validation execution, and PR preparation.

Checklist

• I followed AGENTS.md, CONTRIBUTING.md, and the relevant canonical-owner guidance.
• The change is focused and does not include unrelated local or generated state.
• Tests and documentation match the behavior actually delivered.
• Markdown links were checked when documentation moved or changed. No documentation moved or changed.
• Cross-platform behavior was considered for Windows, macOS, and Linux.
• Package/runtime verification was run when shipped files or dependencies changed.
• User-facing or compatibility changes are recorded in CHANGELOG.md. Not applicable: AGENTS.md prohibits task-external changelog edits without explicit authorization, and Bug [Bug]: Use host-neutral branding in portable HTML reports #115 requires no release metadata change.
• I have the right to contribute this work under the repository's MIT License.