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-26/client.md

@@ -1,3 +1,12 @@
+---
+title: "Sprint 26 — Client Briefing"
+description: "AI-Enhanced Dialogue toggle, hardware detection UX"
+type: sprint
+status: archived
+sprint: 26
+team: "client"
+---
+
 # Sprint 26: Clean House — Client Tasks
 
 **Goal:** Ship the voice pipeline to production by integrating observer, removing v0.1 dead weight, and stabilizing the codebase.

docs/sprints/sprint-26/copy.md

@@ -1,3 +1,12 @@
+---
+title: "Sprint 26 — Copy Briefing"
+description: "D-record amendments, base text elevation pass, remove handwritten Krenn content"
+type: sprint
+status: archived
+sprint: 26
+team: "copy"
+---
+
 # Sprint 26: Clean House — Copy Tasks
 
 **Goal:** Ship the voice pipeline to production by integrating observer, removing v0.1 dead weight, and stabilizing the codebase.

docs/sprints/sprint-26/joint.md

@@ -1,3 +1,12 @@
+---
+title: "Sprint 26 — Joint Briefing"
+description: "Voice pipeline integration coordination, behavior primitive format agreement"
+type: sprint
+status: archived
+sprint: 26
+team: "joint"
+---
+
 # Sprint 26: Clean House — Joint
 
 **Goal:** Ship the voice pipeline to production by integrating observer, removing v0.1 dead weight, and stabilizing the codebase.

docs/sprints/sprint-26/planning.md

@@ -1,3 +1,12 @@
+---
+title: "Sprint 26 — Planning Briefing"
+description: "Update agent profiles and briefings for v0.2"
+type: sprint
+status: archived
+sprint: 26
+team: "planning"
+---
+
 # Sprint 26: Clean House — Planning Tasks
 
 **Goal:** Ship the voice pipeline to production by integrating observer, removing v0.1 dead weight, and stabilizing the codebase.

docs/sprints/sprint-26/server.md

@@ -1,3 +1,12 @@
+---
+title: "Sprint 26 — Server Briefing"
+description: "Composable behavior engine, SQLite settings storage, voice pipeline observer integration"
+type: sprint
+status: archived
+sprint: 26
+team: "server"
+---
+
 # Sprint 26: Clean House — Server Tasks
 
 **Goal:** Ship the voice pipeline to production by integrating observer, removing v0.1 dead weight, and stabilizing the codebase.