fix(completion): avoid network calls when generating completions

[sargunv-headway]

Summary

mise completion is often run on shell init, where network calls while resolving the toolset delay every shell startup. Here we avoid refreshing remote version metadata while generating shell completions.

mise completion builds the active toolset only to provide an environment for running usage generate completion. If usage is unavailable, completion generation already falls back to the prerendered completions.

Verification

• RUSTUP_TOOLCHAIN=stable target/debug/mise run lint-fix
• MISE_LOG_LEVEL=debug MISE_FETCH_REMOTE_VERSIONS_TIMEOUT=1 target/debug/mise completion zsh
  • confirmed no remote GET/WARN output

[greptile-apps]

Greptile Summary

This PR sets offline: true on the ResolveOptions used when mise completion builds its toolset, preventing remote version metadata fetches that were slowing down shell startup. The toolset is only needed to locate usage in the environment, so skipping remote resolution has no functional impact; if usage is unavailable the command already falls back to pre-rendered completions.

• ResolveOptions { offline: true, ..Default::default() } is passed to ToolsetBuilder::with_resolve_options, matching the same pattern used elsewhere (e.g. prune) to skip remote version listing without changing any installed-tool state.
• No other code paths are touched; the full_env call that follows still correctly builds PATH from locally resolved tool versions.

Confidence Score: 5/5

Safe to merge — the change is a one-liner that sets an already-supported offline flag on a path that only needs local tool resolution.

The modification is minimal: it opts in to an existing offline resolution mode already used by other commands such as prune. The completion command only needs the tool environment to locate usage; it never reads freshly fetched remote version lists, so disabling them is a pure latency win with no behavioral regression.

No files require special attention.

Important Files Changed

Filename	Overview
src/cli/completion.rs	Adds offline: true to ResolveOptions when building the toolset for completion generation, preventing remote version fetches on shell startup.

_{Reviews (1): Last reviewed commit: "fix(completion): clarify offline resolut..." | Re-trigger Greptile}

[gemini-code-assist]

Code Review

This pull request updates the shell completion generation in src/cli/completion.rs to use offline resolution when building the toolset. By configuring ToolsetBuilder with offline: true, the change prevents network fetches during shell startup, ensuring a faster and more reliable completion process. I have no feedback to provide as there were no review comments to evaluate.