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-16/client.md

@@ -1,3 +1,12 @@
+---
+title: "Sprint 16 — Client Briefing"
+description: "Zone ID extraction optimization, sprite camera angle adjustment"
+type: sprint
+status: archived
+sprint: 16
+team: "client"
+---
+
 # Sprint 16: Converse — Client Tasks
 
 **Goal:** Dialogue becomes a two-way exchange — players pick options and the server responds; NPC information-giving deepens through trust and trait-shaped delivery; the sprite pipeline gets its correct art-direction angle; and housekeeping fixes land across all three active teams.

docs/sprints/sprint-16/copy.md

@@ -1,3 +1,12 @@
+---
+title: "Sprint 16 — Copy Briefing"
+description: "Migrate line IDs from location-scoped to NPC-scoped namespace"
+type: sprint
+status: archived
+sprint: 16
+team: "copy"
+---
+
 # Sprint 16: Converse — Copy Tasks
 
 **Goal:** Dialogue becomes a two-way exchange — players pick options and the server responds; NPC information-giving deepens through trust and trait-shaped delivery; the sprite pipeline gets its correct art-direction angle; and housekeeping fixes land across all three active teams.

docs/sprints/sprint-16/joint.md

@@ -1,3 +1,12 @@
+---
+title: "Sprint 16 — Joint Briefing"
+description: "Dialogue response integration, sprite pipeline coordination, line ID scheme"
+type: sprint
+status: archived
+sprint: 16
+team: "joint"
+---
+
 # Sprint 16: Converse — Joint Coordination
 
 **Goal:** Dialogue becomes a two-way exchange — players pick options and the server responds; NPC information-giving deepens through trust and trait-shaped delivery; the sprite pipeline gets its correct art-direction angle; and housekeeping fixes land across all three active teams.

docs/sprints/sprint-16/server.md

@@ -1,3 +1,12 @@
+---
+title: "Sprint 16 — Server Briefing"
+description: "Dialogue response handler, trust-gated gossip, line variety tracker"
+type: sprint
+status: archived
+sprint: 16
+team: "server"
+---
+
 # Sprint 16: Converse — Server Tasks
 
 **Goal:** Dialogue becomes a two-way exchange — players pick options and the server responds; NPC information-giving deepens through trust and trait-shaped delivery; the sprite pipeline gets its correct art-direction angle; and housekeeping fixes land across all three active teams.

docs/sprints/sprint-16/visual.md

@@ -1,3 +1,12 @@
+---
+title: "Sprint 16 — Visual Briefing"
+description: "3D sprite render pipeline setup"
+type: sprint
+status: archived
+sprint: 16
+team: "visual"
+---
+
 # Sprint 16: Converse — Visual Tasks
 
 **Goal:** Dialogue becomes a two-way exchange — players pick options and the server responds; NPC information-giving deepens through trust and trait-shaped delivery; the sprite pipeline gets its correct art-direction angle; and housekeeping fixes land across all three active teams.