feat(errors): register SIGN_UP_REQUIRES_INVITE and INVITE_PHONE_NOT_FOUND

[pyramation]

Summary

Registers the two public error codes introduced by invite-only sign-up in constructive-io/constructive-db#3730 so transports classify them as public (403/404) instead of failing safe to an unregistered 500.

• SIGN_UP_REQUIRES_INVITE (403) — raised by every sign_up* function when app_settings_auth.sign_up_requires_invite is on and no invite_token was supplied.
• INVITE_PHONE_NOT_FOUND (404) — raised by claim_app_invite when a phone-addressed invite is claimed by a user who doesn't own that phone (mirror of INVITE_EMAIL_NOT_FOUND).

scripts/db-error-inventory.json and src/generated/registry.generated.ts were regenerated via audit-db-errors.py + generate-registry.py against that branch; curated copy for both codes was added to registry.ts.

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Requested by: @pyramation

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[tenki-reviewer]

Review complete. No issues found — approved ✅.

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This PR updates the Constructive errors package. It adds two new error definitions, SIGN_UP_REQUIRES_INVITE and INVITE_PHONE_NOT_FOUND, to the DB error inventory and registry, and adds a "class": "public" field to several existing error entries while refreshing occurrence counts.

Files	Change
packages/errors/scripts/db-error-inventory.json	Adds the two new invite error entries, marks several existing errors as public, and refreshes occurrence counts.
packages/errors/src/registry.ts	Registers the two new error codes consistently with the inventory.

The inventory and registry stay in sync, the JSON is valid, and no defects were found across correctness, API-data, and holistic review.

_{Reviewed commit: ea074ed}