fix: patch hitl datapart rejection message

[Akatuoro]

Closes #93

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[hyperspace-pr-bot]

Summary

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Fix: Ensure HITL Rejection Messages Are Properly Communicated to the LLM

This PR fixes an issue where rejected HITL (Human-in-the-Loop) tool calls could be misreported to the LLM as having executed, because bare rejection tokens (e.g., "no") were passed through as-is, suppressing LangChain's built-in "did not execute" default message.

What changed

srv/handlers/graph-executor/hitl.js

• Added a new patchRejectMessage function that normalizes reject decisions coming from DataParts by wrapping the message in a clear contextual prefix: "The user rejected this particular tool invocation with the reason: ...".
• Applied patchRejectMessage to the DataPart path in resumeHitl, ensuring both text-based and DataPart-based rejections now consistently produce an unambiguous rejection signal for the LLM.

lib/preview/chat.html

• Updated the "Reject" button in the preview UI to send a structured DataPart ({ decisions: [{ type: "reject", message: "no" }] }) instead of a plain "reject" text string.
• Updated the resume function to support sending either a text part or a data part depending on the type of the decision payload.

tests/integration/graph-executor-unit.test.js

• Added unit tests for patchRejectMessage verifying it correctly wraps rejection messages.
• Added an integration test confirming that a DataPart rejection with a bare token is enriched with the full rejection context before being forwarded to the graph.

CHANGELOG.md

• Added entry: Better message to the LLM on HITL rejection.

Category

🐛 Bug Fix

Closes #93

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PR Bot Information

Version: 1.31.20

• Event Trigger: pull_request.opened
• Correlation ID: 2fc424c0-ad18-11f1-9694-10fe2607d38f
• GithubContextProvider: [0.9.1: ] Rejected HITL tool calls can be reported as executed because parseResumeDecision always forwards raw resume text as decision.message #93
• Output Template: Repository PR Template
• Summary Prompt: Default Prompt
• LLM: anthropic--claude-4.6-sonnet
• File Content Strategy: Full file content