feat(pixel): add identityType parameter to identify()

[bkbooth]

Summary

• Add required identityType: IdentityType parameter (second arg) to Pixel.identify() so the backend can distinguish which identity system a user ID belongs to (passport, steam, epic, etc.)
• Uses the shared IdentityType union from @imtbl/audience-core — same source of truth as the web SDK
• Fix bootstrap command handler to forward all three args (userId, identityType, traits) to identify()
• Updated tests to cover the new parameter, including a new test for calling identify without traits

API change

// Before
pixel.identify('user-1', { email: 'test@example.com' });

// After
pixel.identify('user-1', 'passport', { email: 'test@example.com' });

Test plan

• Existing pixel tests updated to pass identityType
• New test: identify() without traits still sends identityType
• Bootstrap test updated to queue and assert 3-arg identify
• All 65 pixel tests pass

Closes SDK-77

🤖 Generated with Claude Code

[nx-cloud]

View your CI Pipeline Execution ↗ for commit 1eacdbe

Command	Status	Duration	Result
nx run-many -p @imtbl/sdk,@imtbl/checkout-widge...	✅ Succeeded	1s	View ↗

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☁️ Nx Cloud last updated this comment at 2026-04-09 02:52:07 UTC

[github-actions]

✅ Pixel Bundle Size — @imtbl/pixel

Metric	Size	Delta vs main
Gzipped	4184 bytes (4.08 KB)	+21 bytes
Raw (minified)	11245 bytes	+22 bytes

Budget: 10.00 KB gzipped (warn at 8.00 KB)