refactor(prompts): harmonized prompt templates and bolded keywords

- Standardized prompt structures, replacing custom XML-like tags with Markdown.
- Implemented automatic bolding for RFC 2119 keywords (e.g., MUST, SHOULD) in prompt content.
- Simplified environment information provided to agents, removing desktop environment details.
- Updated image generation tool parameters for improved clarity and capacity.

packages/coding-agent/src/commit/agentic/agent.ts

@@ -1,3 +1,4 @@
+import { INTENT_FIELD } from "@oh-my-pi/pi-agent-core";
 import type { Api, Model } from "@oh-my-pi/pi-ai";
 import { Markdown } from "@oh-my-pi/pi-tui";
 import chalk from "chalk";
@@ -245,7 +246,7 @@ function formatToolArgs(args?: Record<string, unknown>): string[] {
 		}
 	};
 	for (const [key, value] of Object.entries(args)) {
-		if (key === "agent__intent") continue;
+		if (key === INTENT_FIELD) continue;
 		visit(value, key);
 	}
 	return lines;

packages/coding-agent/src/commit/agentic/prompts/system.md

@@ -34,5 +34,5 @@ Tool guidance:
 
 ## Changelog Requirements
 
-If changelog targets provided, you MUST call `propose_changelog` before finishing.
+If changelog targets provided, you **MUST** call `propose_changelog` before finishing.
 If you propose split commit plan, include changelog target files in relevant commit changes.