fix(packaging): include Windows hidden console helper

[SuperstructureJH]

Summary

• Follow up merged PR feat(ppt): add independent Kimi-only mode #297 with the Windows Harness runtime resource that landed on the source branch after the merge.
• Package build/windows-hidden-console.mjs beside harness-node-entry.mjs through Electron Builder extraResources.
• Lock the importer, packaged resource, and helper export together with release regressions.
• Document the Windows Harness resource contract in the 0.1.2-rc.1 upgrade note.

Scope

PR #297 already landed the Kimi PPT route, the reduced 22-template catalog, and template textCapacity. This PR is based on current main and contains only the post-merge Windows packaging fix; it does not replay the #297 feature diff or change the template catalog.

Verification

• PASS: npm test -- test/release.test.ts test/windows-hidden-console.test.ts test/kimi-ppt-integration.test.ts — 37/37
• PASS: npm run typecheck
• PASS: npm run build
• PASS: git diff --check upstream/main...HEAD
• BASELINE: full npm test — 690/700 passed; the remaining 10 failures are in model-reasoning-efforts-patch and model-settings-catalog-ux-patch, and reproduce unchanged on upstream/main@8b018c9

Acceptance boundary

The source/resource contract and local build pass. A Windows installer build and packaged Harness startup remain CI/runtime acceptance gates.