docs: correct module/plugin naming convention in skills

[markshust]

Summary

Corrects the module/plugin naming convention in the create-module and create-plugin skills, verified against core framework code.

The skills previously had the directory-casing model backwards for app/ (showed a capitalized app/{Module}/) and were missing the modules/ distributable tier. create-plugin also re-derived the vendor from the project directory name, producing the wrong namespace for app-local modules.

The correct model (confirmed against core)

• Directory + Composer name → always lowercase; PHP namespace → always StudlyCase. Core derives the namespace solely from composer.json psr-4 (ModuleAutoloader), never from directory casing — so lowercase directories are correct, not a bug.
• Three host-project tiers (ProjectPaths + ModuleDiscovery):
  • app/{name}/ — one level deep, single segment, vendor is the literal app → namespace App\{Name}
  • modules/{vendor}/{name}/ — recursive/any depth, two-segment distributable → namespace {Vendor}\{Name}
  • packages/{name}/ — framework monorepo only → namespace Marko\{Name}
• vendor/ is ephemeral and never authored into; modules/ is its manual-install mirror.

Changes

create-module

• Add an explicit "ask for the name if not provided" step
• Replace capitalized app/{Module}/ with lowercase app/{name}/
• Add the modules/{vendor}/{name}/ distributable tier
• Tier-scope the vendor-derivation rule (app-local has no vendor)
• Make the lowercase-dir / StudlyCase-namespace rule explicit

create-plugin

• Inherit {{Vendor}}\{{Name}} from the host module's psr-4 verbatim instead of re-deriving vendor from the project directory name

Verification

Cross-checked against packages/core/src/Module/ModuleDiscovery.php, packages/core/src/Path/ProjectPaths.php, and packages/core/src/Module/ModuleAutoloader.php. Discovery depths, the three directory names, and psr-4-driven (casing-agnostic) namespace registration all match the documented convention. Docs-only change to skill markdown — no code or tests affected.

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