fix: don't mis-split event namespace when it contains a dot

[lio-p]

What

GalaxyClient.track() split the event string on every . and kept the
first 3 parts, so a namespace containing a literal dot (e.g. a package
name like ruamel.yaml) shifted the split and corrupted component/event.

Fix

Take the last two segments as component/eventName (short fixed literals,
never dotted) and everything before as namespace. No-op for the common
case; correct for dotted namespaces.

Same shared root-cause fix as #239 (against main), applied here for the
clickgems deployment where the dotted-namespace case is actively hit.

Testing

Added test/galaxy-client.test.js using Node's built-in node:test (no new
runtime dependency). Run with npm test. A tiny zero-dependency ESM resolver
hook (test/register.mjs, test/extensionless-resolver.mjs) lets the test
import the bundler-style source directly.

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
clickgems	Ready	Preview, Comment	Jul 22, 2026 4:58pm
clickpy	Error		Jul 22, 2026 4:58pm