[Docs Agent] Release of Docs Agent v.0.3.4

[kyolee415]

Description of the change

• Enhanced file processing: Process an entire directory with the agent helpme command and export results to a responses.yaml file.
• Improved session control: Manage conversation context using the --new and --cont flags with agent helpme.
• Debugging tools: Capture detailed logs for troubleshooting and export them to CSV with the new agent write-logs-to-csv command.
• Documentation expansion: Explore updated configuration references, recent release notes, and a new concept doc on chunking.
• Bug fixes: Added fixes for the FIDL splitter, file handling, and blank results, and updates to various README files.

Motivation

Feature request and bug fix

Type of change

Choose one: (Feature request)

Checklist

• [ X] I have performed a self-review of my code.
• [ X] I have added detailed comments to my code where applicable.
• [ X] I have verified that my change does not break existing code.
• [ X] My PR is based on the latest changes of the main branch (if unsure, please run git pull --rebase upstream main).
• [ X] I am familiar with the Google Style Guide for the language I have coded in.
• [ X] I have read through the Contributing Guide and signed the Contributor License Agreement.