Move derive-* macros to dedicated packages

[Copilot]

derive-readers, derive-print-object, and derive-equality were all defined in the monolithic meta-definitions package. They're now split into independent packages under a derive/ directory, each with its own ASDF system, loadable à la carte or all at once.

New packages

File	Package	Export
derive/readers.lisp	meta-definitions.derive.readers	derive-readers
derive/print-object.lisp	meta-definitions.derive.print-object	derive-print-object
derive/equality.lisp	meta-definitions.derive.equality	derive-equality

New ASDF systems

Each derive package has its own standalone system file:

• meta-definitions.derive.readers.asd
• meta-definitions.derive.print-object.asd
• meta-definitions.derive.equality.asd

meta-definitions.derives.asd — umbrella system that depends on all three individual systems.

;; Load everything at once
(asdf:load-system :meta-definitions.derives)

;; Or load only what you need
(asdf:load-system :meta-definitions.derive.readers)
(asdf:load-system :meta-definitions.derive.print-object)
(asdf:load-system :meta-definitions.derive.equality)

;; Usage
(meta-definitions.derive.readers:derive-readers user)
(meta-definitions.derive.equality:derive-equality user)
(meta-definitions.derive.print-object:derive-print-object user)

Removed from meta-definitions

The three derive-* macros and their exports are removed from package.lisp. The core meta-definitions system is unchanged.

[diasbruno]

@copilot Each package must have its own system.

[Copilot]

@copilot Each package must have its own system.

Done in b74940f. Each derive package now has its own .asd file:

• meta-definitions.derive.readers.asd
• meta-definitions.derive.print-object.asd
• meta-definitions.derive.equality.asd

The umbrella meta-definitions.derives.asd now simply depends on all three individual systems rather than loading files directly.