T0: prep — branch baseline, snapshot DB schema, free disk

- Snapshot DB schema to .migration-baseline-schema.sql (ground truth for API port)
- Add BASELINE.md documenting current state before UI redesign
- Pre-flight cleanup: removed node_modules, .next, tsbuildinfo (~527 MB freed)
- Next.js web container stopped (big-bang per user decision)
- Bun 1.3.14 installed via official installer (see script/setup-bun.sh)

Parent: t_e1cbd87d
Follows: HermesBriefcase/Personal/Projects/Project-E-UI-Redesign-Spec.md

script/setup-bun.sh

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+# Idempotent Bun installer — wraps the official installer and sets up PATH.
+# Safe to re-run; skips re-install if bun is already present.
+set -euo pipefail
+
+if command -v bun &>/dev/null; then
+    echo "bun already installed: $(bun --version)"
+    exit 0
+fi
+
+if [ -x "$HOME/.bun/bin/bun" ]; then
+    echo "bun binary found at ~/.bun/bin/bun, adding to PATH"
+    export PATH="$HOME/.bun/bin:$PATH"
+    echo "bun version: $(bun --version)"
+    exit 0
+fi
+
+echo "Installing bun via official installer..."
+curl -fsSL https://bun.sh/install | bash
+
+# Ensure PATH is set for the current session
+export BUN_INSTALL="$HOME/.bun"
+export PATH="$BUN_INSTALL/bin:$PATH"
+
+echo "bun installed: $(bun --version)"