Remove references to .claude folder from commands

[workshur]

Currently, some commands (tech & tasks) reference the .claude folder, which ties command usage specifically to Claude. This creates friction when we want agents and commands to seamlessly support other AI assistants (such as Copilot).
It will also skip subagents registered in the system from the plugin folder, for example.

Requirements:

• Remove all hardcoded references to the .claude folder in commands, scripts, and workflows.
• Refactor command logic and documentation to avoid coupling with assistant-specific folders.
• Ensure agent discovery and command registration rely on system-level registration, not by reading from repo-specific directories (like .claude).

Example:

- Search for all agent definition files in the `.claude/agents/` directory (including subdirectories).
+ Search all agents registered in the system.

Acceptance criteria:

• No command contains references or paths exclusive to Claude (e.g., .claude).

[artemchege]

I will have a look at it also