feat(workshops/digital-engineering): add platform story coverage + delivery variants

[devin-ai-integration]

Summary

Adds Cognition Platform story coverage to the digital-engineering workshop with two delivery variants.

README.md (cloud-agent baseline) — additive changes only:

• New ## Platform Context section after the overview explaining this variant uses Devin Cloud via the web app, with a tip callout linking to Desktop/CLI alternatives
• Variant cross-reference note below the title: **Other variants:** [Desktop + Cloud](README.platform.md)
• Agent Command Center bullet added to the "Getting the Most" tips section
• Cross-surface callout blocks at natural points in existing labs:
  • Desktop tip (one-click PR checkout) in Labs A1 and C2 review sections
  • CLI alternative callout in Lab A2 research section
  • Desktop tip (Agent Command Center for parallel sessions) in Lab B3
• No existing lab structure, track numbering, prompts, repo references, or timing altered

README.platform.md (Desktop + Cloud variant) — new file:

• Same lab structure (3 tracks, 9 labs, same numbering) reframed for Desktop as the primary interface
• Each lab's 4-step workflow restructured: explore locally with Cascade/Devin Local → delegate to Cloud from Desktop → research while Cloud works → review PRs via one-click checkout
• Platform Context section explaining the Desktop + Cloud delivery model and the 5-step workflow continuum (Space → local explore → delegate → Agent Command Center → in-editor review)
• ACP extensibility and multi-agent references woven in where relevant
• Context section updated with Desktop-specific value themes

Link to Devin session: https://partner-workshops.devinenterprise.com/sessions/f382c4cdced64375bd270d62a287046f
Requested by: @bsmitches

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[devin-ai-integration]

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[devin-ai-integration]

Devin Review found 2 new potential issues.

View 3 additional findings in Devin Review.

[devin-ai-integration]

🚩 Platform variant drops DeepWiki extension suggestions from labs

The original README.md labs include a dedicated "Step 3 (Optional): Read the DeepWiki" section with 3-4 concrete extension suggestions per lab (e.g., README.md:100-106 suggests Docker image build, PR status checks, automatic versioning, parallel test sharding). The platform variant consolidates this into a brief DeepWiki mention within its Step 3 research section (e.g., README.platform.md:118). This means attendees using the platform variant lose the specific extension challenges. This appears to be a deliberate editorial choice to keep the platform variant focused on the Desktop+Cloud workflow rather than a content gap, but it's worth confirming this was intentional.

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[devin-ai-integration]

This was intentional. The platform variant consolidates the DeepWiki extension suggestions into the Step 3 research section to keep focus on the Desktop+Cloud workflow. The original README.md still has the full extension suggestions for participants who want them, and both variants cross-reference each other.