chore: release 0.4.0 (engine + cli + dev-server)

[leefanv]

Summary

Version bumps for the Patterns platformization + Bootstrap-from-Figma feature (merged in #7).

Package	Old	New	Why
@omit-design/engine	0.3.1	0.4.0	New importTheme action, BootstrapBanner, 8 built-in palettes; removed suggestedPatterns / importStarters from Library store (breaking)
@omit-design/cli	0.3.0	0.4.0	Removed --starters flag + 8 starter templates from init (breaking); new stdout walks user through PRD-first flow
@omit-design/dev-server	0.1.0	0.2.0	Removed POST /__omit/starters/import; added GET/PUT/DELETE /__omit/bootstrap (breaking)
preset-mobile peer dep	@omit-design/engine ^0.3.0	^0.4.0	Lockstep with engine major-ish bump
templates/init/package.json.tmpl	engine ^0.3 / cli ^0.3 / dev-server ^0.1	^0.4 / ^0.4 / ^0.2	New init scaffolds pull the new majors
packages/cli/src/cli.ts meta.version	0.2.1 (stale)	0.4.0	omit-design --version was lying — fixed

preset-mobile / eslint-plugin / figma-plugin unchanged — only docs touched in #7, no source changes.

Test plan

• bun run build — all packages green
• bun packages/cli/dist/cli.js --version reports 0.4.0
• packages/cli/templates/init/package.json.tmpl reflects new pins (cli build syncs from root templates/init/)
• CHANGELOG header promoted from [Unreleased] to [0.4.0] - 2026-05-11

Publish plan (after merge)

Per docs/release.md:

cd packages/engine     && npm publish --access public
cd ../dev-server       && npm publish --access public
cd ../cli              && npm publish --access public   # dist + templates already up to date

(Run from main after this PR is merged.)

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