docs: add project schedule tools feature specification

Feature spec for MCP tools to query XER schedule data:
- 4 user stories (load file, query activities, relationships, summary)
- 14 functional requirements including pagination (100 item default)
- Clarifications: P6 critical flags, multi-project selection, internal calendars

specs/001-schedule-tools/checklists/requirements.md

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+# Specification Quality Checklist: Project Schedule Tools
+
+**Purpose**: Validate specification completeness and quality before proceeding to planning
+**Created**: 2026-01-06
+**Feature**: [spec.md](../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
+
+- Specification passed all validation checks
+- Clarification session completed 2026-01-06 (4 questions resolved)
+- Ready for `/speckit.plan`
+- 4 user stories defined (2 P1, 1 P2, 1 P3)
+- 14 functional requirements specified (added FR-013, FR-014 for pagination)
+- 7 measurable success criteria defined
+- 5 edge cases documented
+- Pagination limits (100 default) added to User Stories 2 and 3
+- Multi-project handling clarified in User Story 1