feat(spec): create spec for persisting garth session

Defines the user stories, functional requirements, and success criteria for implementing a persistent authentication mechanism.

This feature aims to eliminate repeated user logins for background synchronization tasks by securely storing and reusing the Garmin Connect session state.

specs/010-specification-overview-the/checklists/requirements.md

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+# Specification Quality Checklist: Persist Garmin Authentication for Stateless Sync
+
+**Purpose**: Validate specification completeness and quality before proceeding to planning
+**Created**: 2025-12-22
+**Feature**: [specs/010-specification-overview-the/spec.md](specs/010-specification-overview-the/spec.md)
+
+## Content Quality
+
+- [x] No implementation details (languages, frameworks, APIs)
+- [x] Focused on user value and business needs
+- [x] Written for non-technical stakeholders
+- [x] All mandatory sections completed
+
+## Requirement Completeness
+
+- [x] No [NEEDS CLARIFICATION] markers remain
+- [x] Requirements are testable and unambiguous
+- [x] Success criteria are measurable
+- [x] Success criteria are technology-agnostic (no implementation details)
+- [x] All acceptance scenarios are defined
+- [x] Edge cases are identified
+- [x] Scope is clearly bounded
+- [x] Dependencies and assumptions identified
+
+## Feature Readiness
+
+- [x] All functional requirements have clear acceptance criteria
+- [x] User scenarios cover primary flows
+- [x] Feature meets measurable outcomes defined in Success Criteria
+- [x] No implementation details leak into specification
+
+## Notes
+
+- All items passed validation. The specification is ready for the next phase.