Dependency Refresh — Eight Packages Bumped to Latest Within Current Major, Build Verified Clean

First pass on package hygiene since the project's last broad upgrade. Eight dependencies advanced to the latest version within their current major (obsidian 1.8 → 1.12, esbuild 0.25 → 0.28, fastify 5.3 → 5.8, MCP SDK 1.12 → 1.29, both @typescript-eslint packages, builtin-modules, and @types/node held to the 22.x line to match the local Node 22 runtime). Four major bumps held back for review. The full build (`tsc -noEmit -skipLibCheck && esbuild production`) passes cleanly on the new lockfile.