docs: add cluster update command to README usage section

[botantler]

Summary

Adds the ksail cluster update command to the main usage workflow in README.md.

What Changed

• Added step 5 documenting ksail cluster update command in the usage section
• Renumbered step 5 → 6 (Connect to cluster with K9s)
• Included contextual comment explaining when to use the command

Why

The cluster update command was introduced in v5.30.0 (#2041) and documented in .github/copilot-instructions.md (#2140), but was missing from the README.md usage section. This creates a documentation gap for users who rely on the README as their primary reference.

Documentation Consistency

After this change:

• ✅ .github/copilot-instructions.md - has cluster update
• ✅ README.md - now has cluster update

Testing

• Verified the change renders correctly in Markdown
• Confirmed consistency with copilot-instructions.md command reference
• No code changes - documentation only

Related

• Feature implementation: feat: implement ksail cluster update command with config diff detection and node scaling #2041
• Documentation update: docs: add cluster update command to documentation #2140
• Version: v5.30.0

AI generated by Update Docs

[github-actions]

✅⚠️MegaLinter analysis: Success with warnings

⚠️ MARKDOWN / markdownlint - 38 errors

.github/aw/create-agentic-workflow.md:84 error MD036/no-emphasis-as-heading Emphasis used instead of a heading [Context: "Read the gh-aw instructions"]
.github/aw/create-shared-agentic-workflow.md:16 error MD036/no-emphasis-as-heading Emphasis used instead of a heading [Context: "Build on agentic workflows"]
.github/aw/create-shared-agentic-workflow.md:23 error MD036/no-emphasis-as-heading Emphasis used instead of a heading [Context: "Prefer Docker Solutions"]
.github/aw/create-shared-agentic-workflow.md:30 error MD036/no-emphasis-as-heading Emphasis used instead of a heading [Context: "Support Read-Only Tools"]
.github/aw/create-shared-agentic-workflow.md:37 error MD036/no-emphasis-as-heading Emphasis used instead of a heading [Context: "Move Write Operations to Safe ..."]
.github/aw/create-shared-agentic-workflow.md:44 error MD036/no-emphasis-as-heading Emphasis used instead of a heading [Context: "Process Agent Output in Safe J..."]
.github/aw/create-shared-agentic-workflow.md:57 error MD036/no-emphasis-as-heading Emphasis used instead of a heading [Context: "Documentation"]
.github/aw/create-shared-agentic-workflow.md:153 error MD036/no-emphasis-as-heading Emphasis used instead of a heading [Context: "Example: Processing Agent Outp..."]
.github/aw/debug-agentic-workflow.md:19 error MD036/no-emphasis-as-heading Emphasis used instead of a heading [Context: "Example: Debugging from a work..."]
.github/aw/debug-agentic-workflow.md:25 error MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]
.github/aw/debug-agentic-workflow.md:39 error MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]
.github/aw/debug-agentic-workflow.md:53 error MD036/no-emphasis-as-heading Emphasis used instead of a heading [Context: "Prerequisites"]
.github/aw/debug-agentic-workflow.md:60 error MD036/no-emphasis-as-heading Emphasis used instead of a heading [Context: "Key Commands Available"]
.github/aw/debug-agentic-workflow.md:91 error MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]
.github/aw/debug-agentic-workflow.md:124 error MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]
.github/aw/debug-agentic-workflow.md:162 error MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]
.github/aw/debug-agentic-workflow.md:199 error MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]
.github/aw/debug-agentic-workflow.md:208 error MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]
.github/aw/debug-agentic-workflow.md:218 error MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]
.github/aw/debug-agentic-workflow.md:256 error MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]
.github/aw/debug-agentic-workflow.md:468 error MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]
.github/aw/serena-tool.md:118 error MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]
.github/aw/serena-tool.md:126 error MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]
.github/aw/serena-tool.md:135 error MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]
.github/aw/serena-tool.md:174 error MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]
.github/aw/update-agentic-workflow.md:58 error MD036/no-emphasis-as-heading Emphasis used instead of a heading [Context: "Read the gh-aw instructions"]
.github/aw/update-agentic-workflow.md:523 error MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]
.github/aw/upgrade-agentic-workflows.md:13 error MD036/no-emphasis-as-heading Emphasis used instead of a heading [Context: "Prerequisites"]
.github/aw/upgrade-agentic-workflows.md:20 error MD036/no-emphasis-as-heading Emphasis used instead of a heading [Context: "Key Commands Available"]
.github/aw/upgrade-agentic-workflows.md:265 error MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]
.github/skills/refactor/SKILL.md:37 error MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]
.github/skills/refactor/SKILL.md:563 error MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]
.github/workflows/promote-ksail.md:118 error MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]
.github/workflows/promote-ksail.md:126 error MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]
.github/workflows/update-docs.md:145 error MD028/no-blanks-blockquote Blank line inside blockquote
docs/src/content/docs/faq.md:226 error MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]
pkg/svc/chat/docs/faq.md:226 error MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]
vsce/README.md:98 error MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]

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[Copilot]

Pull request overview

Updates the project’s primary quickstart workflow in README.md to include the ksail cluster update lifecycle command, closing a documentation gap for users who rely on the README as their main entry point.

Changes:

• Added a new usage step documenting ksail cluster update for applying configuration changes after editing ksail.yaml.
• Renumbered the subsequent “Connect to the cluster with K9s” step accordingly.