fix(platform-objects): drop invalid unique validation on sys_user

[os-zhuang]

Problem

main is currently red on Test Core for every PR. packages/platform-objects/src/identity/sys-user.object.ts declares:

validations: [
  { name: 'email_unique', type: 'unique', severity: 'error', message: 'Email must be unique', fields: ['email'], caseSensitive: false },
],

But #1485 ("enforce all declared validation-rule types; trim the unenforceable three") removed 'unique' from the allowed validation-rule discriminator (script | state_machine | format | cross_field | json_schema | conditional). The two changes were a semantic merge conflict — each passed independently, but together sys_user fails schema parse at registration:

ZodError: invalid discriminator value. Expected 'script' | 'state_machine' | 'format' | 'cross_field' | 'json_schema' | 'conditional'
  at packages/platform-objects/src/identity/sys-user.object.ts:16

Fix

Remove the redundant validations block. Email uniqueness is already enforced by the unique index declared on the same object:

indexes: [ { fields: ['email'], unique: true }, ... ]

Uniqueness is an index concern, not an enforceable validation rule — which is exactly why #1485 dropped the type. No behavior change; just removes a now-invalid declaration.

Verification

• @objectstack/platform-objects tests: 52 passed.
• Scanned the repo — sys_user was the only object carrying a trimmed validation-rule type.

This unblocks Test Core on main and on the in-flight ADR-0031 PRs (#1489).

https://claude.ai/code/session_012ti8cx3TkdiQdjCnZXZg2Q

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Project	Deployment	Actions	Updated (UTC)
spec	Error		Jun 1, 2026 8:59pm

[os-zhuang]

Closing as redundant — main no longer carries the invalid type: 'unique' validation on sys_user (it's already been removed upstream), so Test Core is unblocked without this change. The related docs-build break was also fixed independently on main by #1493. No action needed here.

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Generated by Claude Code