docs(docs): add frontmatter templates for docs/ directory

New template system for project documentation with standardized
frontmatter (title, description, type, status, decision_refs).
Templates for architecture, design, briefing, workshop, and test-plan
document types. Enables context-aware loading alongside the existing
wiki template system.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/_templates/architecture.md

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+---
+title: ""                    # Display name (e.g., "Fog Shader Architecture")
+description: ""              # One-line summary for context filtering (e.g., "How fog-of-war rendering works: texture pipeline, shader, and performance")
+type: architecture           # architecture | design | briefing | workshop | test-plan | test-report | audit
+status: active               # active | draft | archived | superseded
+ticket: ""                   # Ticket reference (e.g., "#430")
+decision_refs: []            # e.g., [D-059, D-015]
+author: ""                   # Primary author agent or person
+created: YYYY-MM-DD
+updated: YYYY-MM-DD
+---
+
+# {Title}
+
+## Overview
+
+{What this system/component is, why it exists, how it fits into the architecture.}
+
+---
+
+## Current State
+
+{What is implemented now, what changed since the original design.}
+
+---
+
+## Design
+
+{Technical details: data flow, interfaces, algorithms, constraints.}
+
+---
+
+## Decision References
+
+{Link to relevant D-records and explain how they constrain this design.}
+
+---
+
+## Open Questions
+
+{Anything unresolved. Link to Q-records if filed.}

docs/_templates/briefing.md

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+---
+title: ""                    # Display name (e.g., "Gestalt - Project Briefing")
+description: ""              # One-line summary for context filtering (e.g., "Systems design agent context: v0.2 pivot, generator-first, relevant decisions")
+type: briefing               # architecture | design | briefing | workshop | test-plan | test-report | audit
+status: active               # active | draft | archived | superseded
+agent: ""                    # Agent name this briefing is for
+updated: YYYY-MM-DD
+---
+
+# {Agent} - Project Briefing
+
+## Current Project State
+
+{High-level project status and direction.}
+
+---
+
+## Key Changes for Your Role
+
+{What's changed since the last briefing that affects this agent's work.}
+
+---
+
+## Relevant Decisions
+
+{Bulleted list of D-records this agent needs to know about.}
+
+---
+
+## Current Sprint Tasks
+
+{What this agent should focus on now.}

docs/_templates/design.md

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+---
+title: ""                    # Display name (e.g., "Monologue Content Architecture")
+description: ""              # One-line summary for context filtering (e.g., "Authoring contract for internal monologue: categories, triggers, volume targets")
+type: design                 # architecture | design | briefing | workshop | test-plan | test-report | audit
+status: active               # active | draft | archived | superseded
+ticket: ""                   # Ticket reference (e.g., "#253")
+decision_refs: []            # e.g., [D-016, D-032]
+author: ""                   # Primary author agent or person
+created: YYYY-MM-DD
+updated: YYYY-MM-DD
+---
+
+# {Title}
+
+## Purpose
+
+{What this document defines and who should use it.}
+
+---
+
+## Specification
+
+{The design itself: rules, formats, examples, constraints.}
+
+---
+
+## Examples
+
+{Concrete examples showing correct usage.}
+
+---
+
+## Decision References
+
+{Link to relevant D-records and explain how they constrain this design.}

docs/_templates/test-plan.md

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+---
+title: ""                    # Display name (e.g., "Fog Rendering Visual Test Plan")
+description: ""              # One-line summary for context filtering (e.g., "Test coverage for fog shader: gradient smoothness, alpha tuning, performance budgets")
+type: test-plan              # architecture | design | briefing | workshop | test-plan | test-report | audit
+status: active               # active | draft | archived | superseded
+ticket: ""                   # Ticket reference
+system_under_test: ""        # What system/feature is being tested
+created: YYYY-MM-DD
+updated: YYYY-MM-DD
+---
+
+# {Title}
+
+## Scope
+
+{What is being tested and what is excluded.}
+
+---
+
+## Test Cases
+
+{Numbered test cases with expected results.}
+
+---
+
+## Environment
+
+{Test environment requirements: live server, fixtures, headless, etc.}

docs/_templates/workshop.md

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+---
+title: ""                    # Display name (e.g., "Where's the Fun? Workshop")
+description: ""              # One-line summary for context filtering (e.g., "Multi-agent workshop on v0.2 direction: tycoon bookmark, generator-first, 24 decisions")
+type: workshop               # architecture | design | briefing | workshop | test-plan | test-report | audit
+status: active               # active | draft | archived | superseded
+participants: []             # Agent names involved
+rounds: 0                    # Number of discussion rounds
+decisions_produced: []       # D-records produced (e.g., [D-114, D-117])
+created: YYYY-MM-DD
+updated: YYYY-MM-DD
+---
+
+# {Title}
+
+## Brief
+
+{What question this workshop set out to answer.}
+
+---
+
+## Participants
+
+{Who was involved and what role each played.}
+
+---
+
+## Outcomes
+
+{Key decisions made, with D-record references.}
+
+---
+
+## Open Items
+
+{Anything deferred or unresolved.}