docs: add Auto Efficient tier to Auto Model documentation

[kilo-code-bot]

Summary

• Adds kilo-auto/efficient row to the tier table in auto-model.md (between Balanced and Free)
• Adds Efficient bullet to the Tiers section describing session-aware, benchmark-driven cost routing with Balanced fallback
• Adds a new How Auto Efficient routing works subsection (3-step numbered list + summary) after the Tiers section
• Updates the Flexible Cost Control benefit to mention all four tiers including Efficient
• Updates model-selection.md to reference kilo-auto/efficient in the Free and Budget section for consistency

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Project	Deployment	Actions	Updated (UTC)
docs (docs-staging)	Ready	Preview, Comment	Jun 18, 2026 3:13pm

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (2 files)

• packages/kilo-docs/pages/code-with-ai/agents/auto-model.md
• packages/kilo-docs/pages/code-with-ai/agents/model-selection.md

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_{Reviewed by gpt-5.4-2026-03-05 · 159,374 tokens}

_{Review guidance: REVIEW.md from base branch main}