🧹 Remove unused _get_last_conversation_id function

[sheepdestroyer]

🎯 What: Removed unused _get_last_conversation_id and related variables LAST_CONVERSATIONS_PATH and AGY_WORKSPACE from router/agy_proxy.py.
💡 Why: This code is never used within the file and is dead code. Removing it improves codebase maintainability and readability.
✅ Verification: Verified by ensuring the code was dead and that the full test suite passes. Note that the code review tool mistakenly flagged that tests/test_host_agy_daemon.py needed updating because it tests get_last_conversation_id, but that test file is actually testing scripts.host_agy_daemon.get_last_conversation_id, which is a different function.
✨ Result: Improved code health by removing dead code.

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PR created automatically by Jules for task 13143117984741976096 started by @sheepdestroyer

Summary by Sourcery

Enhancements:

• Remove dead code related to last conversation ID caching, including unused constants and helper function from agy_proxy.

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR removes an unused helper function for reading cached conversation IDs and its associated configuration variables from agy_proxy, cleaning up dead code related to local workspace conversation tracking.

File-Level Changes

Change	Details	Files
Remove dead code for reading last conversation IDs from a cache file.	Delete LAST_CONVERSATIONS_PATH constant definition used for cache file location. Delete AGY_WORKSPACE environment-based workspace identifier definition. Remove unused _get_last_conversation_id helper that read and logged last conversation IDs from the cache JSON file.	router/agy_proxy.py

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⚙️ Run configuration

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📥 Commits

Reviewing files that changed from the base of the PR and between ceb6c2f and 86f37b3.

📒 Files selected for processing (1)

• router/agy_proxy.py

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