greptile: Always emit sequence diagram in PR reviews

[yutanaofficial]

Adds an explicit sequenceDiagramSection block to .greptile/config.json
so the diagram is rendered on every PR review.

No rule changes — the slim three-rule config from roll-out-3 (#240) is
unchanged

[greptile-apps]

Greptile Summary

Adds a sequenceDiagramSection block to .greptile/config.json so Greptile emits a sequence diagram on every PR review. The new block is consistent with the existing section definitions (summarySection, issuesTableSection, confidenceScoreSection) in structure and field naming. No rule changes; the three C-language enforcement rules from the prior roll-out are untouched.

Confidence Score: 5/5

Safe to merge — pure config addition with no logic, security, or behavioral risk.

Single config-only change that adds a well-structured section block consistent with existing patterns. No C code touched, no rules modified, no functional behavior changed in FRR itself.

No files require special attention.

Important Files Changed

Filename	Overview
.greptile/config.json	Adds sequenceDiagramSection config block; structure and values are consistent with all other section definitions in the file.

Sequence Diagram

sequenceDiagram
    participant GH as GitHub PR
    participant Greptile as Greptile Review Bot
    participant Config as .greptile/config.json

    GH->>Greptile: PR opened / updated
    Greptile->>Config: Load configuration
    Config-->>Greptile: sequenceDiagramSection.included = true
    Greptile->>Greptile: Analyze changed files
    Greptile->>GH: Post summary section
    Greptile->>GH: Post issues table section
    Greptile->>GH: Post confidence score section
    Greptile->>GH: Post sequence diagram section (new)

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_{Reviews (1): Last reviewed commit: "greptile: enforce greptile to show seque..." | Re-trigger Greptile}