refactor: Remove experimental terraphim_gen_agent crate and fix compilation issues

- Remove terraphim_gen_agent experimental OTP GenServer-inspired framework
- Fix unused import warnings in workflow modules
- Resolve type mismatch errors in multi-agent handlers
- Clean up dependencies in agent_registry, kg_agents, goal_alignment, and agent_application crates
- Fix WebSocket workflow parameter handling for prompt chaining
- Add Playwright test screenshots for agent workflow examples
- Ensure main workspace compiles successfully with working agent examples

Author: AlexMikhalev

.playwright-mcp/prompt-chaining-initial.png

@@ -24,7 +24,6 @@ notify = "6.0"
 terraphim_agent_supervisor = { path = "../terraphim_agent_supervisor" }
 terraphim_agent_messaging = { path = "../terraphim_agent_messaging" }
 terraphim_agent_registry = { path = "../terraphim_agent_registry" }
-terraphim_gen_agent = { path = "../terraphim_gen_agent" }
 terraphim_kg_orchestration = { path = "../terraphim_kg_orchestration" }
 terraphim_kg_agents = { path = "../terraphim_kg_agents" }
 terraphim_task_decomposition = { path = "../terraphim_task_decomposition" }

.playwright-mcp/workflow-error-state.png

@@ -16,7 +16,6 @@ readme = "../../README.md"
 terraphim_types = { path = "../terraphim_types", version = "0.1.0" }
 terraphim_automata = { path = "../terraphim_automata", version = "0.1.0" }
 terraphim_rolegraph = { path = "../terraphim_rolegraph", version = "0.1.0" }
-terraphim_gen_agent = { path = "../terraphim_gen_agent", version = "0.1.0" }
 terraphim_agent_supervisor = { path = "../terraphim_agent_supervisor", version = "0.1.0" }
 terraphim_agent_messaging = { path = "../terraphim_agent_messaging", version = "0.1.0" }