User Story: Add session management commands for Gemini and Qwen

[eigenverft]

User Story

As a user of Gemini and Qwen named sessions, I want session management commands similar to Codex, so that I can:

• List my stored Gemini/Qwen sessions
• Inspect session details (name, session id, last directory, updated timestamp)
• Remove stale sessions
• Clear all sessions when needed

Current State

Codex has these session helpers:

• Get-CodexSession - List all or get specific session
• Remove-CodexSession - Remove a session
• Set-CodexSessionDirectory - Update session directory
• Clear-CodexSessions - Clear all sessions

Gemini and Qwen have none of these.

Acceptance Criteria

Get-GeminiSession

• List all stored Gemini sessions
• Get specific session by -SessionName
• Returns: SessionName, SessionId, LastDirectory, UpdatedUtc

Get-QwenSession

• List all stored Qwen sessions
• Get specific session by -SessionName
• Returns: SessionName, SessionId, LastDirectory, UpdatedUtc

Remove-GeminiSession

• Remove a specific Gemini session by name
• Requires -Force confirmation

Remove-QwenSession

• Remove a specific Qwen session by name
• Requires -Force confirmation

Clear-GeminiSessions

• Clear all Gemini sessions
• Requires -Force confirmation

Clear-QwenSessions

• Clear all Qwen sessions
• Requires -Force confirmation

Example Usage

# List all Gemini sessions
Get-GeminiSession

# Get specific Qwen session
Get-QwenSession -SessionName "qwen-repo1"

# Remove a stale session
Remove-GeminiSession -SessionName "old-project" -Force

# Clear all Qwen sessions
Clear-QwenSessions -Force

Notes

• Copy pattern from existing Codex session functions
• Session stores: named-gemini-sessions.json, named-qwen-sessions.json
• No need to implement Set-*SessionDirectory initially (less critical)