Consolidate agent delegation prompt

[aj47]

Summary

• merge ACP agents, personas, and internal agent into one delegation block
• compact ACP prompt output to single-line entries
• update system prompt construction to use unified block

Testing

• Not run (see apps/desktop/DEBUGGING.md)

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[augmentcode]

🤖 Augment PR Summary

Summary: Consolidates agent delegation prompt generation into a single unified block to reduce duplication and keep delegation guidance compact.

Changes:

• Updated ACP smart router to emit compact, per-agent delegation lines
• Replaced separate ACP/persona/internal prompt additions with getAgentDelegationPromptAddition()
• Adjusted system prompt construction to inject the unified delegation block in agent mode
• Updated unit test mocks for the renamed smart-router API

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[augmentcode]

Review completed. 2 suggestions posted.

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[augmentcode]

(def.description || def.displayName || 'External agent').trim() can become an empty string if the configured description/displayName is whitespace, resulting in a blank delegation entry. Consider applying the fallback after trimming so the prompt line always has a non-empty summary.

Severity: low

Other Locations

• apps/desktop/src/main/system-prompts.ts:156

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[augmentcode]

Because the internal agent line is always pushed (line 164), the if (lines.length === 0) branch is unreachable and the docstring about returning an empty string is currently misleading. If the intent was to sometimes omit the entire block, this logic will never do that in agent mode.

Severity: low

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