[SPIKE option B] Event oneOf + hydrate missing source to device (INTER-2457)

[JuroUhlar]

• Option B spike. Do not merge. Compare with option C: #272.
• Event stays a merged bag. DISCRIMINATOR = source looks up non-existent device / edge classes, so codegen never splits the oneOf.
• Missing source hydrates to device in Event construction and ObjectSerializer::deserialize. source: edge is never rewritten.

Discussion point: hydrate vs flatten

Option B keeps the generated discriminator and patches omit → device. Option C (#272) keeps a single Event (source optional) and adds /edge as EventEdge separately.

Known issue: PHP still merges oneOf fields

The same flattening happens for EventRuleAction (allow + block fields on one class). PHP surviving the union is a codegen quirk, not proof this shape is safe.

[github-actions]

⚠️ Template files and generated files are not in-sync.

Following files do not match corresponding templates:
src/Api/FingerprintApi.php src/Model/Event.php src/ObjectSerializer.php

To fix this warning, make sure template files are up-to-date, and generate files by running the following command:

bash ./scripts/generate.sh

[github-actions]

⚠️ This PR doesn't contain any changesets. If there are user-facing changes, don't forget to run:

pnpm exec changeset

to create a changeset.

[github-actions]

Wrong commit message format detected

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Commitlint Errors

Commit: 93d2de3 `chore: SPIKE Event oneOf discriminated union

INTER-2457. Regenerated Event with a source discriminator to show PHP does not split the union. Do not merge.`
Errors:

• subject must not be sentence-case, start-case, pascal-case, upper-case

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[github-actions]

🟢 Coverage increased by 82.63%

Code Coverage Report

Coverage Report

St.	Category	Percentage	Covered / Total
🟢	Statements	82.63%	3630 / 4393
🟢	Functions	83.19%	1435 / 1725

Files Coverage

St.	File	Methods	Statements	Total Coverage