feat: Add agents and agents settings

sources/agents/ollama_gemma4_e4b_chat.toml

@@ -0,0 +1,36 @@
+schema_version = 1
+
+name    = "Ollama gemma4:e4b Chat"
+extends = "Ollama Base Chat"
+
+description = "Local Gemma 4 E4B on Ollama /api/chat — coding chat assistant."
+
+model = "gemma4:e4b"
+
+role = """
+You are a helpful coding assistant integrated into Qt Creator.
+Answer concisely. When the user shares code, prefer concrete diffs or
+minimal patches over rewriting whole files. Use markdown code blocks
+with language tags so the IDE can render them.
+"""
+
+enable_thinking = true
+enable_tools    = true
+
+tags = ["chat", "ollama", "local", "gemma"]
+
+context = """
+{%- set readme      = read_file("${PROJECT_DIR}/README.md")        -%}
+
+{%- if length(readme) > 0 %}
+## Project README.md
+{{ readme }}
+{%- endif %}
+"""
+
+[template.sampling.options]
+num_predict = 4096
+temperature = 1
+top_k       = 64
+top_p       = 0.95
+num_ctx     = 8192