Delete deprecated packages for Stackflow 2.0 migration

[tonyfromundefined]

Summary

• Delete 3 deprecated packages superseded by Future API: @stackflow/compat-await-push, @stackflow/plugin-preload, @stackflow/plugin-map-initial-activity
• Remove all dependency references from demo/package.json and extensions/link/package.json
• Remove preload logic from extensions/link/src/stable/Link.tsx
• Delete corresponding API reference docs and update _meta.json navigation files

Test plan

• yarn install succeeds with no workspace errors
• yarn build passes (including docs build)
• No imports of deleted packages remain in demo/src/

🤖 Generated with Claude Code

[changeset-bot]

⚠️ No Changeset found

Latest commit: adb2c4e

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

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[pkg-pr-new]

• @stackflow/demo

  yarn add https://pkg.pr.new/@stackflow/link@696.tgz
  

commit: adb2c4e

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Latest commit:	adb2c4e
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Preview URL:	https://1153d1f0.stackflow-demo.pages.dev
Branch Preview URL:	https://tony-future-to-stable.stackflow-demo.pages.dev

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	stackflow-docs	adb2c4e	Commit Preview URL	Apr 10 2026, 02:47 AM