feat(skills): integrate start-sprint into sprint-start skill

Move start-sprint.sh into .claude/skills/sprint-start/scripts/ (was
standalone at parent directory level). Sprint-start Case B now calls
the script automatically after activating a sprint — creates ephemeral
worktrees and opens Ptyxis tabs for each active team.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.claude/settings.json

@@ -64,6 +64,8 @@
       "Bash(list *)",
       "Bash(tree *)",
       "Bash(sed -n *)",
+      "Bash(.claude/skills/sprint-start/scripts/start-sprint.sh *)",
+      "Bash(.claude/skills/sprint-start/scripts/sprint-teardown.sh *)",
 
       "Skill(git-commit)",
       "Skill(sprint-start)",

.claude/skills/sprint-start/SKILL.md

@@ -209,10 +209,20 @@ If everything looks ready, activate the sprint:
 tooling/db/sprint start
 ```
 
-Then report:
+Then open team terminal tabs automatically:
+
+```bash
+.claude/skills/sprint-start/scripts/start-sprint.sh
+```
+
+This creates ephemeral worktrees under `.sprint/sprint-{N}/{team}/` for
+each team with open tickets, and opens Ptyxis windows with tmux + Claude
+auto-starting in each tab. The user will have one tab per active team.
+
+Report:
 - Sprint activated (name, ticket count per team)
-- Remind the user to switch to a team branch and run `/sprint-start`
-  there (or run `start-sprint` to open team tabs)
+- Worktrees created and tabs opened
+- Each team tab runs `/sprint-start` to load briefing and spawn agents
 
 ---
 

.claude/skills/sprint-start/scripts/start-sprint.sh

@@ -0,0 +1,73 @@
+#!/bin/bash
+# Opens Ptyxis windows for the active sprint teams.
+# Auto-starts Claude Code in each tab via tmux.
+#
+# Usage: start-sprint.sh [sprint-number]
+#   If omitted, auto-detects the active sprint from the database.
+#
+# Window 1:  main (always)
+# Window 2:  one tab per active team with open tickets
+#
+# Worktrees are created under .sprint/ (ephemeral, cleaned after sprint close).
+# Can be called from any directory — resolves paths from the script location.
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+# Script lives at .claude/skills/sprint-start/scripts/ — repo root is 4 levels up
+REPO_ROOT="$(cd "$SCRIPT_DIR/../../../.." && pwd)"
+# Parent of repo root is where .sprint/ and the DB live
+PARENT="$(dirname "$REPO_ROOT")"
+
+# Resolve sprint number — argument or active sprint from DB
+if [ -n "${1:-}" ]; then
+  SPRINT="$1"
+else
+  SPRINT=$(cd "$REPO_ROOT" && tooling/db/sqlite-query "SELECT id FROM sprints WHERE status='active'" 2>/dev/null | python3 -c "import sys,json; print(json.load(sys.stdin)['rows'][0]['id'])" 2>/dev/null || true)
+  if [ -z "$SPRINT" ]; then
+    echo "error: no active sprint found. Pass a sprint number or activate a sprint first." >&2
+    exit 1
+  fi
+fi
+
+# Query teams with open tickets
+TEAMS=$(cd "$REPO_ROOT" && tooling/db/sqlite-query "SELECT DISTINCT team FROM tickets WHERE sprint_id=$SPRINT AND status NOT IN ('done','cancelled')" 2>/dev/null | python3 -c "import sys,json; [print(r['team']) for r in json.load(sys.stdin)['rows']]" 2>/dev/null || true)
+
+if [ -z "$TEAMS" ]; then
+  echo "Sprint $SPRINT has no open tickets. Opening main only."
+fi
+
+echo "Sprint $SPRINT — teams: ${TEAMS:-none}"
+
+# ── Window 1: main (always) ─────────────────────────────────────────
+ptyxis --new-window -d "$REPO_ROOT" -x 'tmux new-session \; send-keys claude Enter'
+sleep 0.5
+
+# ── Window 2: one tab per active team ───────────────────────────────
+first=true
+for team in $TEAMS; do
+  BRANCH="sprint-${SPRINT}/${team}"
+  WDIR="$PARENT/.sprint/sprint-${SPRINT}/${team}"
+
+  # Create worktree if it doesn't exist
+  if [ ! -d "$WDIR" ]; then
+    echo "Creating worktree: $WDIR (branch: $BRANCH)"
+    mkdir -p "$(dirname "$WDIR")"
+    # Create branch from main if it doesn't exist remotely
+    if git -C "$REPO_ROOT" rev-parse --verify "origin/$BRANCH" >/dev/null 2>&1; then
+      git -C "$REPO_ROOT" worktree add "$WDIR" "$BRANCH"
+    else
+      git -C "$REPO_ROOT" worktree add -b "$BRANCH" "$WDIR" HEAD
+    fi
+  fi
+
+  if $first; then
+    ptyxis --new-window -d "$WDIR" -x 'tmux new-session \; send-keys claude Enter'
+    first=false
+  else
+    ptyxis --tab -d "$WDIR" -x 'tmux new-session \; send-keys claude Enter'
+  fi
+  sleep 0.3
+done
+
+echo "Session ready. Main + ${TEAMS:-(no teams)}"