feat: add built-in PPT Capability

[SuperstructureJH]

Summary

• add PPT Capability as a built-in DSH Desktop plugin while retaining the shared external-host Slides/JSX core
• ship one Slides mode and remove the independent PPT/PPTD route, compiler, CLI, tools, production dependencies, and PPT mode button
• place the Slides entry immediately to the right of the standard-mode selector in one compact control cluster
• keep the Composer fixed when Slides opens; render categories directly below it and let the template gallery fill the remaining viewport with independent scrolling
• keep the compact selected-template preview inline before prompt text and collapse the selection UI after the session starts
• ship only the 44 MIT-licensed Kimi templates and remove the separately purchased data-analysis and vitality-blue templates and previews
• let public-repository users run the Apple Silicon development build directly: the first npm run dev downloads and verifies the separately distributed closed-source Slides runtime, then later runs reuse the content-addressed cache
• merge the current upstream/main@7cb9e04, including 0.8.0-rc.3

Implementation

• pin reviewed Slides-only core and standard Composer adapter archives by SHA-256
• mount the Harness 0.1.2-alpha.4 standard adapter in the Desktop profile
• add a conversation.hero.modeActions host slot and group it with conversation.hero.agentPreset in one content-width flex container
• collapse the agent-preset trigger wrapper's inherited 360 px minimum width inside that cluster, keeping Standard mode and Slides visually adjacent while preserving the dropdown width
• retain the existing input accessory and Composer dock slots for the selected-template preview and independently scrolling gallery
• persist one selected template state and inject the tencent-pptx Skill plus five Slides tools
• preserve the 332 public Kimi source-page previews required for template and page reference
• remove the purchased-template Host definitions, browser preview payloads, visual-reference loading branches, exports, and package content
• keep SlideP and Tencent Docs AI engine source outside this repository; publish the darwin-arm64 runtime as a separately licensed binary archive
• lock the public runtime URL, byte size, archive SHA-256, platform/version metadata, 9,919-file runtime tree, critical file hashes, and executable permission
• download into a staging directory, reject unsafe archive paths, verify before atomic cache publication, and reuse only a fully verified cache
• pass the verified development cache root only to Harness; copy the same locked runtime into Electron Resources during Apple Silicon packaging
• keep development available with Slides disabled on platforms that do not yet have a published matching runtime
• launch editor_sdk from the plugin data directory so logs do not modify App Resources
• make development packaging deterministic with identity: null, then apply one bundle-wide ad-hoc signature in afterPack; formal release signing and notarization remain unchanged

Public runtime

• Release: https://github.com/SuperstructureJH/dsh-desktop/releases/tag/ppt-capability-runtime-v1
• asset: ppt-capability-runtime-darwin-arm64-5.4.1-0.2.112-wb.tar.gz
• compressed size: 207,169,828 bytes
• archive SHA-256: ca273302786617b722e98aa0976386a497e287db72880d07257bb32cd3d33a1d
• runtime tree SHA-256: 6b65a93d812b51d10eb8b7d406afdc36579588c4c22b27a41bc2a6847f449ad8
• unpacked runtime: about 563 MiB
• the binary is a public download, remains closed-source, and is outside this repository's MIT license

Size

• core archive: 29,238,986 bytes
• standard adapter archive: 6,973,632 bytes
• latest verified macOS arm64 internal-test ZIP: 412,510,079 bytes
• ZIP SHA-256: 44a7892e56272f3685598b241168f75851bd6e75c3c5aedb3d7ada3bbf3242e5
• artifact: ppt-capability-slides-adjacent-main-7cb9e04-mac-arm64.zip
• the 332 source-page previews and the Slides platform runtime remain the main size contributors

Verification

• Slides source and adapter bundles built cleanly; 35 focused source tests and both Host/Client TypeScript builds passed
• release archives contain no PPTD CLI, PPTD bundle, Kimi/PPTD Skill entry, independent PPT tools, PPT compiler production dependencies, PPT mode button, or removed private-template payloads
• a real empty-cache run downloaded all 207,169,828 bytes from the public Release, verified the archive and full extracted tree, and installed it under its content digest
• the second runtime preparation reused and reverified the cache; the launcher passed the exact verified root to its child process
• DSH Desktop runtime/resource/release focused suite: 50/50 passed
• DSH Desktop full suite: 84 files / 695 tests passed
• npm run typecheck and npm run build passed
• Apple Silicon Electron Builder directory packaging consumed the downloaded runtime and embedded it in Resources/workbuddy-ppt-runtime
• the embedded runtime passed the locked platform/version/tree/hash/permission gate
• the final App passed strict deep code-signature verification, and Electron 43.4.0 loaded from the packaged executable

Delivery boundaries

• zero-configuration Slides runtime download is currently published and verified for macOS Apple Silicon
• Intel macOS and Windows keep the base Desktop development flow available with Slides disabled until matching runtime assets are published
• native Slides UI regression and a fresh real deck generation remain user acceptance steps for this candidate
• PowerPoint/WPS edit-save-close-reopen remains a separate Office acceptance gate
• Developer ID signing and notarization remain release-pipeline work