feat(assistant): implement spec 021 chat assistant flow with semantic contracts

specs/021-llm-project-assistant/checklists/requirements.md

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+# Specification Quality Checklist: LLM Chat Assistant for Project Operations
+
+**Purpose**: Validate specification completeness, UX alignment, and safety before planning  
+**Created**: 2026-02-23  
+**Feature**: [spec.md](../spec.md)
+
+## Content Quality
+
+- [x] No implementation details (framework internals, code-level design)
+- [x] Focused on user value and operational outcomes
+- [x] All mandatory sections completed
+- [x] User stories are independently testable
+
+## UX Consistency
+
+- [x] Functional requirements support happy path in `ux_reference.md`
+- [x] Error experience in UX is reflected in requirements (clarification, deny, timeout, failure)
+- [x] Response states are explicitly defined for frontend rendering
+
+## Security & Safety
+
+- [x] RBAC enforcement is mandatory for every execution path
+- [x] Risky operations require explicit confirmation
+- [x] Confirmation expiration/cancel behavior is defined
+- [x] No hidden execution path for unconfirmed dangerous actions
+
+## Requirement Completeness
+
+- [x] No `[NEEDS CLARIFICATION]` markers remain
+- [x] Requirements are testable and unambiguous
+- [x] Edge cases include ambiguity, permission denial, invalid targets, duplicate actions
+- [x] Success criteria are measurable and technology-agnostic
+- [x] Assumptions and dependencies are identified
+
+## Feature Readiness
+
+- [x] Scope includes all requested command domains (Git, migration/backup, analysis/docs, status)
+- [x] Long-running operation feedback with `task_id` is explicitly required
+- [x] Tracking through existing Task Drawer/reports is explicitly required
+- [x] Specification is ready for `/speckit.plan` and `/speckit.tasks`
+
+## Notes
+
+- Validation iteration: 1
+- Result: PASS
+- No blocking issues found.