Remove broken claude x installation method from docs

[omar-y-abdi]

Fixes #862. The claude x command no longer works with newer Claude Code versions. Removes the code tab and details block from the installation guide.

Summary by CodeRabbit

• Documentation
  • Removed installation and usage documentation for a code execution workflow from the installation guide, including setup procedures, configuration examples, and related technical references.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 13cb3290-b9b2-4d1e-bc9d-ddcfd0267358

📥 Commits

Reviewing files that changed from the base of the PR and between cd88cb6 and c96bcbe.

📒 Files selected for processing (1)

• docs/guide/installation.md

💤 Files with no reviewable changes (1)

• docs/guide/installation.md

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📝 Walkthrough

Walkthrough

This PR removes the "Running with claude x" installation section from the documentation. The section provided instructions for using BUN_BE_BUN=1 claude x ccusage, which does not function as documented because the Claude Code binary does not support the x subcommand or the BUN_BE_BUN environment variable passthrough.

Changes

Cohort / File(s)	Summary
Documentation Cleanup docs/guide/installation.md	Removed 31 lines containing the non-functional "Running with `claude x`" subsection, including code examples and explanatory content about using Bun's standalone executable feature with Claude Code.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Possibly related PRs

• docs: add BUN_BE_BUN=1 claude x / opencode x execution method #814 — Directly reverts the same "Running with `claude x`" documentation section and related Claude x usage examples.

Poem

🐰 Bad docs are away, hopping far,
No more claude x under a star!
With truth we rebuild, clean and bright,
Installation guides done right! ✨

🚥 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 specifically summarizes the main change: removing a broken claude x installation method from documentation.
Linked Issues check	✅ Passed	The pull request fully addresses the requirements from issue #862 by removing the non-functional claude x tab and details block from docs/guide/installation.md.
Out of Scope Changes check	✅ Passed	All changes are directly related to fixing issue #862; only the broken claude x documentation sections are removed with no extraneous modifications.
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
• Post copyable unit tests in a comment

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