`mandatory-architect` lint to enforce presence of `+architect` is absent

[ext11n7]

Problem

The project enforces the presence of several important metas via dedicated lints:

• mandatory-home requires +home to be present
• mandatory-package requires +package to be present
• mandatory-spdx requires +spdx to be present
• mandatory-version requires +version to be present

However, there is no mandatory-architect lint that requires +architect to be present. The existing incorrect-architect lint only validates the format of +architect when it is already there — but does not enforce its presence.

This breaks the symmetry of the existing pattern. Moreover, unique-metas already lists +architect alongside +version, +home, and +package as a meta that must be unique — which implies it is expected to be present. The atom-without-rt lint examples also consistently include +architect in all correct code samples.

Suggestion

Add a new lint mandatory-architect that reports an ERROR level defect when a program does not declare a +architect meta.

Example of bad code

+home https://github.com/objectionary/eo

+package org.eolang

+version 0.0.0
Foo.
[] > foo

42 > @

Expected fix

+architect foo@example.com

+home https://github.com/objectionary/eo

+package org.eolang

+version 0.0.0
Foo.
[] > foo

42 > @

This would complete the symmetry with mandatory-home, mandatory-package, mandatory-spdx, and mandatory-version.

[ext11n7]

@yegor256

[0crat]

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