Enhance conversation actions, indexing, and self-help features

[robgruen]

This pull request updates the documentation for TypeAgent, focusing on improving the completeness, clarity, and accuracy of command references and agent system descriptions. The main changes include expanded documentation for conversation management commands, a rework of the system help/describe agent, and the addition of several new configuration and Copilot commands.

Conversation Management Enhancements:

• Added documentation for new conversation subcommands: find (fuzzy name search) and search (content search), with explanations of their behavior and corresponding actions. [1] [2] [3] [4]
• Updated the @conversation command reference to include all subcommands, their arguments, and links to their equivalent action handlers. [1] [2] [3] [4] [5]
• Clarified how the browser extension delegates conversation management and updated subcommand lists for accuracy. [1] [2]
• Added summarize conversation action/command.

System Help and Describe Improvements:

• Replaced the system.describe agent with a unified system.help agent that handles TypeAgent questions, conceptual explanations, and agent/action capability discovery, with improved fallback behavior for unknown agents.
• Added a new section for the @describe command, detailing its usage, arguments, and flags.

Copilot Command Additions:

• Documented new Copilot commands: @copilot fix (send session to Copilot for diagnosis/fix) and @copilot login (sign in to Copilot), including all arguments and flags.

Configuration Command Additions:

• Added documentation for outbound secret scrubbing commands: @config scrub on and @config scrub off.
• Added commands for managing translation recent actions: @config translation recentActions on/off/limit.

Other Improvements:

• Linked conversation and history commands to their equivalent action handlers for easier cross-referencing. [1] [2] [3]
• Fixed formatting for wildcard directory references in collision optimization commands. [1] [2]
• Added a messageCount field to the ConversationInfo type for improved conversation diagnostics.

These updates provide more comprehensive and user-friendly documentation for working with TypeAgent's conversation, configuration, and Copilot integration features.

[robgruen]

@copilot resolve the merge conflicts in this pull request

[Copilot]

@copilot resolve the merge conflicts in this pull request

Resolved by merging origin/main and fixing the merge fallout in f64da93d (merge commit: a6834f81).