fix: resolve symlink handling for entry point detection on POSIX systems

[basilkot]

Problem

When the package is installed via npm/npx, the bin entry is exposed as a
symlink (for example node_modules/.bin/cof-mcp -> ../@virtocommerce/cof-mcp/dist/index.js).
The direct string comparison between process.argv[1] and
fileURLToPath(import.meta.url) therefore fails on POSIX systems, main()
is silently skipped, and the process exits with code 0 producing no output —
which manifests as the server "starting and immediately disconnecting"
under Claude Desktop on macOS/Linux.

Fix

Canonicalize process.argv[1] with fs.realpathSync and compare canonical
file:// URLs via pathToFileURL. Works on macOS, Linux, and Windows.

Test plan

• Run on macOS via `npx` — server stays up and responds to MCP requests.
• Run on Linux via globally installed `cof-mcp` — same.
• Run on Windows (no symlinks) — no regression.

[OlegoO]

@AJITHMELVIN @timdauer Any updates or thoughts?

[joshfischer-cin7]

Ajith saw this, has some feedback. Will follow up

[OlegoO]

Ajith saw this, has some feedback. Will follow up

Ok, waiting for the feedback

[OlegoO]

@joshfischer-cin7 any updates?