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feat(packs): opt-in package packs — media/office/dev/gaming/containers/compat

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Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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# modules/packs
Opt-in **packs** — bundles of (packages + services + config) toggled with
`omni.packs.<name>.enable`. This is the "core + goodies" layer: core is
always on; packs are off until you ask for them.
Full guide (enabling, standalone import, authoring, bitcoin specifics,
verification): **[`docs/packs.md`](../../docs/packs.md)**.
## Pattern
Each pack is one self-contained module, **always imported but inert** until
enabled (hlissner-style enable-gate):
```nix
{ config, lib, pkgs, ... }:
let cfg = config.omni.packs.media; in {
options.omni.packs.media.enable = lib.mkEnableOption "Media pack";
config = lib.mkIf cfg.enable { environment.systemPackages = with pkgs; [ … ]; };
}
```
## Files
| File | Purpose |
|---|---|
| `default.nix` | Aggregator — imports every pack + `compat.nix`. Wired into the build once, via `lib/mksystem.nix`. The ISO bypasses mksystem, so it stays pack-free. |
| `compat.nix` | Back-compat bridge: maps legacy `omni.features.*` → `omni.packs.*.enable` (mkDefault). Aggregator-only, so standalone imports don't pull in `omni.features`. |
| `media.nix`, `development.nix`, `gaming.nix`, `office.nix`, `containers.nix` | Desktop-bundle packs (migrated from `packages.nix` categories + the feature-gated bits of `core.nix`/`development.nix`). Omnixient-coupled (use `omni.lib.filterPackages`). |
| `lnbits.nix` | Wraps `../dev-env` and enables it. **Standalone-importable** (dev-env is decoupled from `omni.*`). |
| `aiolabs.nix` | Imports the gated aiolabs preset (`../dev-env/presets/aiolabs.nix`) and pulls in `lnbits`. **Standalone-importable.** |
| `bitcoin.nix` | nix-bitcoin node (bitcoind + clightning). **NOT in the aggregator** — nix-bitcoin's module asserts on import even when disabled; exposed as `nixosModules.bitcoin` for explicit per-host import. |
## Exposed as flake outputs
`flake.nixosModules.{media,development,gaming,office,containers,lnbits,
aiolabs,bitcoin}` — reusable across a second host (`gizmo`) and third
parties. `lnbits`/`aiolabs`/`bitcoin` work on a non-Omnixient NixOS.
## Adding a pack
See [`docs/packs.md` → Authoring a new pack](../../docs/packs.md#authoring-a-new-pack).
In short: copy the template, register in `default.nix` (unless it has
import-time side effects), expose in `flake.nix`, keep it
`config.omni.<core>`-free if it should be standalone, and verify the
omni closure is unchanged with `nix store diff-closures`.