Refine installer layering and Python/Nix integration

- Introduce explicit CLI layer model (os-packages, nix, python, makefile)
  and central InstallationPipeline to orchestrate installers.
- Move installer orchestration out of install_repos() into
  pkgmgr.actions.repository.install.pipeline, using layer precedence and
  capability tracking.
- Add pkgmgr.actions.repository.install.layers to classify commands into
  layers and compare priorities.
- Rework PythonInstaller to always use isolated environments:
  PKGMGR_PIP override → active venv → per-repo venv under ~/.venvs/<identifier>,
  avoiding system Python and PEP 668 conflicts.
- Adjust NixFlakeInstaller to install flake outputs based on repository
  identity: pkgmgr/package-manager → pkgmgr (mandatory) + default (optional),
  all other repos → default (mandatory).
- Tighten MakefileInstaller behaviour, add global
  PKGMGR_DISABLE_MAKEFILE_INSTALLER switch, and simplify install target
  detection.
- Rewrite resolve_command_for_repo() with explicit Repository typing,
  better Python package detection, Nix/PATH resolution, and a
  library-only fallback instead of raising on missing CLI.
- Update flake.nix devShell to provide python3 with pip and add pip as a
  propagated build input.
- Remove deprecated/wip repository entries from config defaults and drop
  the unused config/wip.yml.

https://chatgpt.com/share/69399157-86d8-800f-9935-1a820893e908

config/defaults.yaml

@@ -380,17 +380,6 @@ repositories:
       - 44D8F11FD62F878E
       - B5690EEEBB952194
 
-- account: kevinveenbirkenbach
-  alias: infinito-presentation
-  description: This repository contains a Infinito.Nexus presentation designed for customers, end-users, investors, developers, and administrators, offering tailored content and insights for each group.
-  homepage: https://github.com/kevinveenbirkenbach/infinito-presentation
-  provider: github.com
-  repository: infinito-presentation
-  verified:
-    gpg_keys:
-      - 44D8F11FD62F878E
-      - B5690EEEBB952194
-
 - account: kevinveenbirkenbach
   description: A lightweight Python utility to generate dynamic color schemes from a single base color. Provides HSL-based color transformations for theming, UI design, and CSS variable generation. Optimized for integration in Python projects, Flask applications, and Ansible roles.
   homepage: https://github.com/kevinveenbirkenbach/colorscheme-generator
@@ -599,17 +588,6 @@ repositories:
       - 44D8F11FD62F878E
       - B5690EEEBB952194
 
-- account: kevinveenbirkenbach
-  desciption: Infinito Inventory Builder — a containerized web application that dynamically generates Ansible inventory files from invokable Infinito.Nexus roles through an interactive, browser-based interface.
-  homepage: https://github.com/kevinveenbirkenbach/infinito-inventory-builder
-  alias: invbuild
-  provider: github.com
-  repository: infinito-inventory-builder
-  verified:
-    gpg_keys:
-      - 44D8F11FD62F878E
-      - B5690EEEBB952194
-
 - account: kevinveenbirkenbach
   desciption: A simple Python CLI tool to safely rename Linux user accounts using usermod — including home directory migration and validation checks.
   homepage: https://github.com/kevinveenbirkenbach/user-rename

config/wip.yml

@@ -1,7 +0,0 @@
-- account: kevinveenbirkenbach
-  alias: gkfdrtdtcntr
-  provider: github.com
-  repository: federated-to-central-social-network-bridge
-  verified:
-    gpg_keys:
-    - 44D8F11FD62F878E