docs(15-01): complete create gsd-planner agent plan

Tasks completed: 2/2
- Task 1: Create gsd-planner agent file (1,147 lines)
- Task 2: Verify agent completeness (all 14 sections present)

SUMMARY: .planning/phases/15-dedicated-planner-agent/15-01-SUMMARY.md

.planning/phases/15-dedicated-planner-agent/15-01-SUMMARY.md

@@ -0,0 +1,106 @@
+---
+phase: 15
+plan: 01
+subsystem: agents
+tags: [planner, agent, planning, methodology]
+
+dependency-graph:
+  requires: [13, 14]
+  provides: [gsd-planner-agent, consolidated-planning-methodology]
+  affects: [future-plan-phase-refactor]
+
+tech-stack:
+  added: []
+  patterns: [consolidated-agent, thin-orchestrator-pattern]
+
+key-files:
+  created: [agents/gsd-planner.md]
+  modified: []
+
+key-decisions:
+  - "14 sections covering complete planning workflow"
+  - "1,147 lines consolidated from ~3,580 lines of source material"
+  - "Follows gsd-debugger/gsd-researcher pattern"
+
+metrics:
+  duration: "5 min"
+  completed: "2026-01-16"
+---
+
+# Phase 15 Plan 01: Create gsd-planner Agent Summary
+
+**One-liner:** Consolidated ~3,580 lines of planning references into 1,147-line dedicated agent following gsd-debugger/gsd-researcher pattern.
+
+## Accomplishments
+
+1. **Created gsd-planner agent file** (`agents/gsd-planner.md`)
+   - Complete planning methodology baked into single agent file
+   - 1,147 lines (within 800-1200 target)
+   - 14 sections covering full planning workflow
+   - Follows established agent patterns from Phase 13-14
+
+2. **Consolidated planning methodology from source files:**
+   - `references/principles.md` - Solo developer + Claude workflow philosophy
+   - `workflows/plan-phase.md` - Full execution flow with 16 steps
+   - `templates/phase-prompt.md` - PLAN.md structure and frontmatter
+   - `references/plan-format.md` - Task anatomy and types
+   - `references/scope-estimation.md` - Context budget and split signals
+   - `references/checkpoints.md` - Checkpoint types and authentication gates
+   - `references/tdd.md` - TDD detection and plan structure
+   - `references/goal-backward.md` - Must-haves derivation process
+
+3. **Agent sections implemented:**
+   - `<role>` - Planning agent identity and responsibilities
+   - `<philosophy>` - Plans are prompts, quality degradation curve, ship fast
+   - `<discovery_levels>` - Levels 0-3 with triggers
+   - `<task_breakdown>` - Task anatomy, types, TDD detection
+   - `<dependency_graph>` - Wave analysis, vertical slices
+   - `<scope_estimation>` - Context budget, split signals, depth calibration
+   - `<plan_format>` - PLAN.md structure, frontmatter schema
+   - `<goal_backward>` - Truths, artifacts, key_links derivation
+   - `<checkpoints>` - Types, authentication gates, anti-patterns
+   - `<tdd_integration>` - When to use, plan structure, RED-GREEN-REFACTOR
+   - `<gap_closure_mode>` - Planning from verification gaps
+   - `<execution_flow>` - 16 steps from load_project_state to offer_next
+   - `<structured_returns>` - PLANNING COMPLETE, CHECKPOINT REACHED formats
+   - `<success_criteria>` - Standard mode and gap closure mode checklists
+
+## Technical Details
+
+**Source material (~3,580 lines):**
+- principles.md: ~73 lines
+- plan-phase.md: ~868 lines
+- phase-prompt.md: ~575 lines
+- plan-format.md: ~474 lines
+- scope-estimation.md: ~257 lines
+- checkpoints.md: ~789 lines
+- tdd.md: ~264 lines
+- goal-backward.md: ~287 lines
+
+**Consolidation result:**
+- 1,147 lines (68% reduction from source material)
+- Preserved all critical concepts
+- Eliminated redundancy between source files
+- Kept concise examples for each concept
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Commits
+
+| Commit | Type | Description |
+|--------|------|-------------|
+| 1f45bef | feat | Create gsd-planner agent file |
+
+## Next Phase Readiness
+
+**Ready for Plan 15-02:** Refactor plan-phase.md to thin orchestrator
+- gsd-planner agent contains all planning expertise
+- plan-phase.md can be reduced to ~200 lines orchestrator
+- Will spawn gsd-planner subagent for actual planning work
+
+**Dependencies satisfied:**
+- Agent file exists and is complete
+- All 14 sections verified present
+- Follows established pattern from gsd-debugger/gsd-researcher