feat: add nix package

[tarik02]

What changed

• Added flake packages for x86_64 and ARM64 Linux and macOS, including shell completions.
• Locked the upstream T3 Code source to the repository's submodule revision.
• Added native CI builds for all four systems.
• Added a pull request check that maintains one comment with proposed source-pin, lockfile, and pnpm hash changes.
• Documented installation through nix profile.

Why

Keeping this derivation in a consumer repository allowed the CLI source, upstream source, and pnpm dependency hash to drift independently. The package now lives beside the lockfile and submodule that define its build. Pull requests receive the required Nix changes before merge instead of a follow-up repair PR.

Verification

• nix build .#packages.x86_64-linux.default --builders ''
• nix flake check --all-systems --no-build
• t3cli --version
• nixfmt --check flake.nix nix/package.nix
• actionlint

[changeset-bot]

⚠️ No Changeset found

Latest commit: 958c35b

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[chatgpt-codex-connector]

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Reviewed commit: 8fe1f923fb

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[chatgpt-codex-connector]

Restrict the Nix installation claim to x86_64 Linux

On aarch64 Linux or either Darwin architecture, this documented command cannot resolve a default package because flake.nix defines packages.default only for x86_64-linux. Either expose the package for the additional supported Nix systems or state the architecture restriction here so users on other systems are not given a nonfunctional installation command.

Useful? React with 👍 / 👎.

[github-actions]

The Nix source pin or pnpm dependency hash is stale. Apply this change to the pull request:

diff --git a/flake.lock b/flake.lock
index b78a9e4..547b4a6 100644
--- a/flake.lock
+++ b/flake.lock
@@ -42,17 +42,17 @@
     "upstream-t3code": {
       "flake": false,
       "locked": {
-        "lastModified": 1786361740,
-        "narHash": "sha256-qZi9hMGzqpmnpqvvVtsQvkZIiVqTgOMWv1y15MiSAYg=",
+        "lastModified": 1786783355,
+        "narHash": "sha256-G6sttzF/SChyPCzR7nFIEMFnNjrBul0bP4pa7kS2M9M=",
         "owner": "pingdotgg",
         "repo": "t3code",
-        "rev": "3b72d17cbca691f0b64e6d4a10c9e349f42873a5",
+        "rev": "f0ebc628c6dd83fd0c7963078ad7778ce6028d0c",
         "type": "github"
       },
       "original": {
         "owner": "pingdotgg",
         "repo": "t3code",
-        "rev": "3b72d17cbca691f0b64e6d4a10c9e349f42873a5",
+        "rev": "f0ebc628c6dd83fd0c7963078ad7778ce6028d0c",
         "type": "github"
       }
     }
diff --git a/flake.nix b/flake.nix
index b15ce7a..3a080b6 100644
--- a/flake.nix
+++ b/flake.nix
@@ -6,7 +6,7 @@
     nixpkgs-darwin.url = "github:NixOS/nixpkgs/nixpkgs-26.05-darwin";
 
     upstream-t3code = {
-      url = "github:pingdotgg/t3code/3b72d17cbca691f0b64e6d4a10c9e349f42873a5";
+      url = "github:pingdotgg/t3code/f0ebc628c6dd83fd0c7963078ad7778ce6028d0c";
       flake = false;
     };
   };