feat(nix): install completions

[betaboon]

Summary by CodeRabbit

• New Features
  • Shell completion support for Bash, Fish, and Zsh shells is now available and automatically installed.

[greptile-apps]

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[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 624338c1-348a-46f6-a479-1f7dc043a0a5

📥 Commits

Reviewing files that changed from the base of the PR and between af0b341 and d98d602.

📒 Files selected for processing (1)

• flake.nix

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📝 Walkthrough

Walkthrough

The flake.nix file is updated to add shell completion generation as part of the build process. The changes include adding installShellFiles to build inputs and implementing a postInstall hook that generates and installs Bash, Fish, and Zsh completions for the openspec command while disabling telemetry during installation.

Changes

Cohort / File(s)	Summary
Build Configuration flake.nix	Added installShellFiles to nativeBuildInputs and introduced a conditional postInstall hook to generate and install shell completions (Bash, Fish, Zsh) for the openspec command, with telemetry disabled during the build process.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 Shell completions hop into place,
Bash, Fish, and Zsh join the race,
A postInstall hook so neat,
Makes command-line tips complete!
Telemetry silenced with care,
Building binaries with flair! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'feat(nix): install completions' accurately describes the main change—adding shell completion installation to the Nix build configuration.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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