chore: add log-tag lint + fix biome errors + pre-push hook

- scripts/lint-log-tags.sh: static check for invalid Crockford Base32 log tags (I/L/O/U)
- fix two invalid log tags in ws-client.ts (6CJX2RLP→6CJX2R8P, T9W2KL5H→T9W2K35H)
- fix biome errors: unused import, exhaustive deps, cognitive complexity suppression
- add pre-push git hook running bun run check
- integrate lint-log-tags into bun run check pipeline

Refs #244

scripts/lint-log-tags.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+# Validate Crockford Base32 log tags in .log("TAG", ...) calls.
+# Crockford Base32 excludes: I, L, O, U
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "$0")/.." && pwd)"
+BAD=0
+
+while IFS= read -r match; do
+  file="${match%%:*}"
+  rest="${match#*:}"
+  line="${rest%%:*}"
+  tag=$(echo "$rest" | grep -oP '\.log\(\s*"\K[A-Za-z0-9]+')
+  if echo "$tag" | grep -qiE '[ILOU]'; then
+    echo "  ❌ ${file}:${line}  tag \"${tag}\" contains invalid Crockford Base32 char (I/L/O/U)"
+    BAD=1
+  fi
+done < <(grep -rn '\.log("[A-Za-z0-9]\{8\}"' "$ROOT/packages/" --include='*.ts' \
+  | grep -v node_modules | grep -v '/dist/')
+
+if [ "$BAD" -eq 0 ]; then
+  echo "  ✅ All log tags are valid Crockford Base32"
+fi
+exit $BAD