refactor: thread agent packages via option, drop overlay and forge-tools shim

nix/packages/default.nix

@@ -117,8 +117,8 @@ in
 {
   # All workspace binaries in one derivation — a symlinkJoin over the
   # per-bin packages, pure assembly with no extra compilation. The
-  # NixOS module's `pkgs.hyperhive` (= this) and `nix build .#` both
-  # land here.
+  # host module's `services.hyperhive.c0re.package` and `nix build .#`
+  # both land here.
   default = pkgs.symlinkJoin {
     name = "hyperhive";
     paths = lib.attrValues binPkgs;

nix/packages/hive-forge-tools.nix

@@ -1,35 +0,0 @@
-{ pkgs, lib }:
-# hive-forge — Forgejo CLI wrapper for hyperhive.
-#
-# Previously a ~600-line bash script. Rewritten as a proper Rust
-# binary in `/hive-forge` so we get:
-#   - typed clap subcommands (`hive-forge <verb> --help` instead of
-#     reading the case statement),
-#   - one reqwest client with consistent error surfaces (no more
-#     `curl --fail-with-body` repeated per verb),
-#   - sane shell quoting (no more HEREDOC-eaten-by-positional traps),
-#   - and a single test surface.
-#
-# This Nix file is now a thin extractor: it pulls just the
-# `hive-forge` binary out of the hyperhive workspace package so
-# agents that already imported this file via
-# `pkgs.callPackage ../packages/hive-forge-tools.nix { }` keep
-# working, getting only the verb they need on PATH (not the full
-# `hive-c0re` / `hive` surface).
-#
-# Requires the hyperhive overlay (see `flake.nix`'s `overlays.default`)
-# so `pkgs.hyperhive` resolves.
-let
-  _ = lib; # placeholder; kept so callers don't break when reading the args.
-in
-pkgs.runCommand "hive-forge"
-  {
-    meta = {
-      description = "Forgejo CLI wrapper for hyperhive (Rust)";
-      mainProgram = "hive-forge";
-    };
-  }
-  ''
-    mkdir -p $out/bin
-    ln -s ${pkgs.hyperhive}/bin/hive-forge $out/bin/hive-forge
-  ''