feat: auto-bump fable-mcp patch version on commit via Claude Code hook

- scripts/bump_fable_mcp_version.sh: increments patch in pyproject.toml and stages it
- scripts/pre_commit_fable_mcp.sh: PreToolUse Bash hook — fires before git commits,
  bumps version if fable-mcp files (other than pyproject.toml itself) are staged
- .claude/settings.json: registers the PreToolUse hook

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scripts/bump_fable_mcp_version.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+# Bump the patch segment of fable-mcp/pyproject.toml version and stage the file.
+# Usage: called automatically by the Claude Code pre-commit hook, or manually.
+set -euo pipefail
+
+REPO_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+FILE="$REPO_ROOT/fable-mcp/pyproject.toml"
+
+current=$(grep '^version = ' "$FILE" | sed 's/version = "\(.*\)"/\1/')
+major=$(echo "$current" | cut -d. -f1)
+minor=$(echo "$current" | cut -d. -f2)
+patch=$(echo "$current" | cut -d. -f3)
+new_version="$major.$minor.$((patch + 1))"
+
+sed -i "s/^version = \"$current\"/version = \"$new_version\"/" "$FILE"
+git -C "$REPO_ROOT" add "$FILE"
+echo "fable-mcp: $current → $new_version"