docs: misc cleanup for agents

[ishandhanani]

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Summary by CodeRabbit

• Documentation
  • Comprehensively expanded HiCache documentation with tier-aware shared KV cache routing specifications, field transitions, configuration options, Prometheus metrics reference, and enhanced troubleshooting guidance including symptom-to-fix mapping.
  • Removed "SGLang for Agentic Workloads" from documentation navigation.

[coderabbitai]

Walkthrough

This PR updates the HiCache documentation to reflect tier-aware shared KV cache routing and refines operational guidance. The sglang-hicache.md file is updated with clarified tier-aware event transitions, configuration flags, worked examples, and expanded verification/troubleshooting metrics. The navigation config removes a deprecated agentic workloads link.

Changes

HiCache Documentation and Navigation

Layer / File(s)	Summary
Document title and HiRadixCache event transitions docs/backends/sglang/sglang-hicache.md	Title updated from "HiCache" to "Using HiCache"; event transition model explicitly documents tier transitions (GPU/Host/External) and their emitted medium field values.
Configuration flags and worked examples docs/backends/sglang/sglang-hicache.md	Shared-cache-type configuration flag table added with env var and defaults; worked example table demonstrates how shared-pool hits beyond device overlap influence prefill and worker logit scoring.
Verification and troubleshooting guidance docs/backends/sglang/sglang-hicache.md	Verification section expanded with new frontend Prometheus metric definitions (shared cache hit rate, beyond-block counts); troubleshooting symptom matrix provides symptom→cause→fix guidance.
Navigation cleanup docs/index.yml	"SGLang for Agentic Workloads" entry removed from Agents navigation section.

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (1 warning, 1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The pull request description is essentially empty, containing only a Devin Review badge link with no substantive content about the changes, objectives, or implementation details.	Complete the description using the provided template: add an Overview section, Details section describing the changes made, point out key files for review (docs/backends/sglang/sglang-hicache.md and docs/index.yml), and include any related GitHub issues.
Title check	❓ Inconclusive	The title 'docs: misc cleanup for agents' is vague and overly generic, using the non-descriptive term 'misc cleanup' that does not convey meaningful information about the changeset.	Replace with a more specific title reflecting the actual changes, e.g., 'docs: remove SGLang agents documentation and update HiCache guide' or 'docs: update HiCache documentation and remove agents page link'.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@docs/backends/sglang/sglang-hicache.md`:
- Around line 61-69: The doc uses two different medium labels (`CPU` in the
transition table vs `CPU_PINNED` in the verification example), causing
confusion; choose a single canonical label (e.g., replace all occurrences of
`CPU` in the transition table with `CPU_PINNED` or vice versa) and update every
emitted-event example (e.g., `store(CPU)`, `remove(CPU)`) to match the canonical
label, or alternatively add one clear note mapping `CPU` ↔ `CPU_PINNED` and
reference it where events are listed (ensure `store(CPU)`/`remove(CPU)` and the
verification example use the same term).

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 6ea54e43-8ce4-4d30-833a-7485e87eedc5

📥 Commits

Reviewing files that changed from the base of the PR and between 78146fe and 38d203a.

📒 Files selected for processing (2)

• docs/backends/sglang/sglang-hicache.md
• docs/index.yml

💤 Files with no reviewable changes (1)

• docs/index.yml

[dynamo-ops]

docs/index.yml — This navigation entry still points to the deleted docs/integrations/sglang-hicache.md path, so the HiCache page will be broken in the docs. Fix: update it and other inbound links to backends/sglang/sglang-hicache.md or keep a stub/redirect at the old path.

[github-actions]

🌿 Fern Docs Preview: https://nvidia-preview-7bdb007a-486e-4172-b0f1-409293b22ea6.docs.buildwithfern.com/dynamo/dev