⚡ Optimize shell startup: run dotfiles git fetch in background

[kidchenko]

💡 What: Moved the git fetch operation in tools/update.sh to the background by appending &.

🎯 Why: The script is called during shell login (via .zlogin). The synchronous git fetch operation was blocking shell initialization, causing a noticeable delay (simulated >2s) depending on network conditions.

📊 Measured Improvement:

• Baseline (simulated network lag): ~2.06s
• Optimized: ~0.02s
• Improvement: >100x speedup (non-blocking)

This change allows the shell to start immediately. The update check will rely on the state from the previous background fetch (eventual consistency), ensuring the prompt appears on the next login if updates are found, without forcing the user to wait every time.

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PR created automatically by Jules for task 1995358614050402535 started by @kidchenko

Summary by CodeRabbit

• Chores
  • Optimized update process execution for improved efficiency.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

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[coderabbitai]

📝 Walkthrough

Walkthrough

A git fetch operation in tools/update.sh was modified to execute in the background by appending an ampersand (&) to the command, enabling concurrent execution with subsequent variable lookups while the fetch completes.

Changes

Cohort / File(s)	Summary
Background Execution tools/update.sh	Git fetch command modified to run asynchronously in the background, allowing subsequent LOCAL and REMOTE variable assignments to proceed concurrently with fetch completion.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 A speedy fetch now runs in the night,
While lookups race along in flight,
Background magic, swift and keen—
The fastest git workflow you've seen! ✨

🚥 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 accurately describes the main change: running git fetch in the background to optimize shell startup performance.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch perf/update-sh-background-fetch-1995358614050402535

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