feat: introduce AI agent framework and task tooling

- add AGENT.md describing the agent system
- add AGENT_WORKFLOW.md defining the execution workflow
- add AI_TASK_TEMPLATE.md for structured task prompts
- add scripts/ai-task CLI tool for generating standardized agent tasks

AI_TASK_TEMPLATE.md

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+# AI Task Template
+
+Reusable prompt template for launching tasks with AI agents.
+
+This template enforces the repository workflow defined in:
+
+- AGENT.md
+- AGENT_WORKFLOW.md
+- instructions-agent.md
+
+It ensures every task follows the deterministic sequence:
+
+PLAN → REVIEW → BUILD → VALIDATE → LOG
+
+---
+
+# Basic Task Structure
+
+Use the following structure when requesting work from an AI agent.
+
+```
+Task Type:
+PLAN | BUILD
+
+Task ID:
+PLAN-YYYYMMDD-XXX | BUILD-YYYYMMDD-XXX
+
+Date:
+YYYY-MM-DD HH:MM
+
+Objective:
+Short description of the goal.
+
+Context:
+Relevant background about the current repository state.
+
+Scope:
+List of files or directories the agent may modify or inspect.
+
+Requirements:
+Detailed description of the behavior that must be implemented or analyzed.
+
+Constraints:
+Things the agent must NOT change or must preserve.
+
+Testing:
+Describe expected tests or validations.
+
+Validation:
+The agent must run:
+
+make fix
+make quality
+
+Logging requirements:
+- Append an entry to docs/ai-worklog.md
+- Append an entry to docs/ai-prompts.md
+- Include Date, Task ID, Agent, Scope, Result
+
+Git requirements:
+- Do NOT commit or push unless explicitly requested.
+
+Expected Report:
+The agent must summarize:
+- files changed
+- behavior changes
+- validation results
+```
+
+---
+
+# Example BUILD Task
+
+```
+Task Type:
+BUILD
+
+Task ID:
+BUILD-YYYYMMDD-XXX
+
+Date:
+YYYY-MM-DD HH:MM
+
+Objective:
+Improve vertical scrolling behavior in the terminal UI.
+
+Scope:
+- src/app/ui.py
+- tests/test_ui.py
+
+Requirements:
+Ensure the selected entry remains visible when navigating through long directory lists.
+
+Constraints:
+Do not modify navigator logic.
+
+Testing:
+Add helper tests if necessary.
+
+Validation:
+make fix
+make quality
+
+Logging requirements:
+Update ai-worklog.md and ai-prompts.md using the standard log format.
+```
+
+---
+
+# Example PLAN Task
+
+```
+Task Type:
+PLAN
+
+Task ID:
+PLAN-YYYYMMDD-XXX
+
+Date:
+YYYY-MM-DD HH:MM
+
+Objective:
+Investigate inconsistent navigation behavior.
+
+Scope:
+- src/app/ui.py
+- src/app/navigator.py
+
+Requirements:
+Analyze the current navigation flow and propose a minimal fix.
+
+Constraints:
+Do not modify code.
+
+Expected Output:
+- diagnosis summary
+- proposed changes
+- expected file scope
+```
+
+---
+
+# Notes
+
+This template keeps AI interactions consistent across tasks and helps maintain a clean development history.