chore: pin systems to UnstoppableMango/nix-systems

[UnstoppableMango]

Part of a fleet-wide change. The Hercules CI agents are x86_64-linux only, so the darwin outputs this flake offers queue against an agent that does not exist and the job never schedules.

UnstoppableMango/nix-systems carries both the system list and the CI subset. Its flake module sets herculesCI.ciSystems and nothing else, so systems = import inputs.systems; stays and the flake still offers every system it did before — only what CI builds changes.

Adding an aarch64-linux agent later is one commit in the pin plus a lockfile refresh here.

Verified on this repo: nix eval .#herculesCI.ciSystems is [ "x86_64-linux" ], and nix flake show --all-systems still lists the darwin outputs.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Configuration
  • Updated system configuration sources.
  • Added support for loading system-related flake modules during project configuration.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: aee3d26e-bb5e-4ec2-9be0-77537b32dee6

📥 Commits

Reviewing files that changed from the base of the PR and between a7b9659 and 6e1e42d.

⛔ Files ignored due to path filters (1)

• flake.lock is excluded by !**/*.lock

📒 Files selected for processing (1)

• flake.nix

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

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📝 Walkthrough

Walkthrough

The flake now uses github:UnstoppableMango/nix-systems and imports systems.flakeModule through flake-parts.

Changes

Systems flake integration

Layer / File(s)	Summary
Systems input and module wiring flake.nix	The systems input uses the new repository. The flake-parts imports include systems.flakeModule.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to 6e1e4

This change restricts Hercules CI builds to the available x86_64-linux agents without removing local Darwin outputs. The locked dependency and stated evaluated behavior support merging with no current merge-blocking risk.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: pinning the systems input to UnstoppableMango/nix-systems.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/systems-pin

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[Copilot]

🟢 Approval recommended

The change is narrowly scoped to flake input pinning and module import, with no detected wiring or evaluation issues in the updated flake.nix/flake.lock diff.

Pull request overview

Pins the flake’s systems input to UnstoppableMango/nix-systems and imports its flake module so Hercules CI only targets the intended CI system set (while still exposing all flake outputs for all supported systems).

Changes:

• Switch inputs.systems from nix-systems/triplet to UnstoppableMango/nix-systems.
• Import systems.flakeModule to set herculesCI.ciSystems via the pinned systems input.
• Update flake.lock to the new input source and revision.

File summaries

File	Description
flake.nix	Repoints the systems input and imports systems.flakeModule to drive CI system selection.
flake.lock	Updates the lock entry for systems to UnstoppableMango/nix-systems with the new pinned rev/hash.

Review details

• Files reviewed: 1/2 changed files
• Comments generated: 0
• Review effort level: Lite

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