docs(docs): add frontmatter to all sprint briefings

Standardized YAML frontmatter on all 115 sprint briefing files across
sprints 1-26 with title, description, type, status, sprint number, and
team fields.

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

docs/sprints/sprint-14/client.md

@@ -1,3 +1,12 @@
+---
+title: "Sprint 14 — Client Briefing"
+description: "Monologue display, passive dialogue panel, F3 debug overlay"
+type: sprint
+status: archived
+sprint: 14
+team: "client"
+---
+
 # Sprint 14: Live — Client Tasks
 
 **Goal:** Bring NPCs to life — mood, trust, routine execution, and NPC-to-NPC conversation drive the first emergent social observables; the simulation produces a world that breathes independently of the player.

docs/sprints/sprint-14/copy.md

@@ -1,3 +1,12 @@
+---
+title: "Sprint 14 — Copy Briefing"
+description: "Monologue content architecture, character voice variation, tagged line pool structure"
+type: sprint
+status: archived
+sprint: 14
+team: "copy"
+---
+
 # Sprint 14: Live — Copy Tasks
 
 **Goal:** Bring NPCs to life — mood, trust, routine execution, and NPC-to-NPC conversation drive the first emergent social observables; the simulation produces a world that breathes independently of the player.

docs/sprints/sprint-14/joint.md

@@ -1,3 +1,12 @@
+---
+title: "Sprint 14 — Joint Briefing"
+description: "NPC mood/trust/routine systems, dialogue layers, monologue pools coordination"
+type: sprint
+status: archived
+sprint: 14
+team: "joint"
+---
+
 # Sprint 14: Live — Joint / Integration Notes
 
 **Goal:** Bring NPCs to life — mood, trust, routine execution, and NPC-to-NPC conversation drive the first emergent social observables; the simulation produces a world that breathes independently of the player.

docs/sprints/sprint-14/server.md

@@ -1,3 +1,12 @@
+---
+title: "Sprint 14 — Server Briefing"
+description: "NPC mood state machine, trust progression, routine execution system"
+type: sprint
+status: archived
+sprint: 14
+team: "server"
+---
+
 # Sprint 14: Live — Server Tasks
 
 **Goal:** Bring NPCs to life — mood, trust, routine execution, and NPC-to-NPC conversation drive the first emergent social observables; the simulation produces a world that breathes independently of the player.

docs/sprints/sprint-14/visual.md

@@ -1,3 +1,12 @@
+---
+title: "Sprint 14 — Visual Briefing"
+description: "Entity color system spec, text display hierarchy, sound indicator visual design"
+type: sprint
+status: archived
+sprint: 14
+team: "visual"
+---
+
 # Sprint 14: Live — Visual Tasks
 
 **Goal:** Bring NPCs to life — mood, trust, routine execution, and NPC-to-NPC conversation drive the first emergent social observables; the simulation produces a world that breathes independently of the player.