refactor(agentic): extract templates subsystem with encapsulated API

[Diplow]

• Create dedicated templates subsystem at lib/domains/agentic/templates/
• Move template logic from prompt-builder.ts to _prompt-builder.ts
• Add _system-template.ts with SYSTEM tile template constants
• Add dependencies.json declaring mustache and mapping dependencies
• Clean index.ts to only re-export public API (buildPrompt, PromptData)
• Make itemType required in PromptData (remove fallback behavior)
• Fix cross-domain imports to use public mapping API
• Add README.md documenting subsystem responsibilities

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Project	Deployment	Review	Updated (UTC)
hexframe	Ready	Preview, Comment	Jan 2, 2026 4:16pm

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