feat(workshops/data-source-migration): add platform story coverage + delivery variants

[devin-ai-integration]

Summary

Adds platform story coverage to the data-source-migration workshop with two changes:

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

• Variant header linking to README.platform.md
• ## Platform Context section after Overview: explains this is a Devin Cloud / web-app delivery, with a > **Tip:** callout pointing to Desktop + CLI alternatives
• Cross-surface callout blocks placed at natural points in the existing lab:
  • > **Desktop tip:** after Step 1 (one-click PR checkout) and Step 4 (Agent Command Center)
  • > **CLI alternative:** after Step 2 (local exploration with devin)
• New bullet in tips section about tracking parallel sessions via Agent Command Center
• No existing lab structure, prompts, timing, or content altered

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

• Same lab structure (Lab 1, same repo, same objective, same target outcomes)
• Workflow reframed for Desktop as primary interface:
  1. Create a Space for the workshop
  2. Explore code locally with Cascade / Devin Local
  3. Delegate implementation to Devin Cloud from Desktop
  4. Monitor in Agent Command Center (Kanban view)
  5. Review PRs with one-click checkout in-editor
• ## Platform Context section explaining Desktop + Cloud delivery
• ACP callout noting third-party agent extensibility
• Two additional Key Takeaways on the Desktop command center and platform continuum

Link to Devin session: https://partner-workshops.devinenterprise.com/sessions/924acf3e81584b10a531d4ef7aa10abc
Requested by: @bsmitches

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[devin-ai-integration]

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[devin-ai-integration]

Devin Review found 2 potential issues.

View 1 additional finding in Devin Review.

[devin-ai-integration]

🚩 Pre-existing prompt in README.md is not line-wrapped at ~80 chars

The prompt in workshops/data-source-migration/README.md:56-62 has lines well over 80 characters (e.g., line 58 is ~200+ chars). AGENTS.md requires "Line-wrap prompts at ~80 chars for readability." The same prompt in the new workshops/data-source-migration/README.platform.md:77-92 IS properly line-wrapped. This is a pre-existing issue — the PR didn't modify the prompt lines in README.md — but the inconsistency between the two variants is notable. The prompt lines fall outside the changed diff hunks, so this cannot be reported as a bug per the review constraints.

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[devin-ai-integration]

Devin Review found 1 new potential issue.

View 1 additional finding in Devin Review.

[devin-ai-integration]

🚩 No automation narrative (webhooks, scheduled sessions, child sessions) in either variant

AGENTS.md states "Every module and workshop should incorporate applicable principles from shared/general-themes/" including "automation narrative: webhooks, scheduled sessions, child sessions for divide-and-conquer." Neither the Cloud-only README.md nor the new README.platform.md mentions these concepts. This is pre-existing for README.md and carried over to the new platform variant. Whether automation narrative is "applicable" to a data source migration workshop is a judgment call — it's plausible that scheduled sessions or child sessions could be relevant for large-scale migration scenarios. This is a medium-priority general themes integration item per REVIEW.md.

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[devin-ai-integration]

Acknowledged — this is a pre-existing gap in the base workshop content, not introduced by this PR. The scope here was limited to adding platform context sections and cross-surface callouts without altering existing lab content. Adding automation narrative (scheduled sessions, child agents for large-scale migrations) would be a good follow-up but falls outside this PR's scope.