[Gaalbu]

Resolves #4560

Changes

The Tcl grammar keyword list stopped at Tcl 8.5, so 8.6 and 9.0 commands such as try, throw, tailcall, lmap, lpop, and the TclOO commands were not highlighted. Namespaced keywords never matched either, because the default keyword pattern is \w+. That already affected pkg::create and platform::shell, and it blocks oo::class, tcl::prefix, and tcl::process.

This adds the commands listed in the issue, checked against the Tcl 9.0.4 command index. The keyword pattern is /(::)?[a-zA-Z_]\w*(::\w+)*/, so a namespaced command matches as one word. Variables still match first, so $ns::var is unchanged. Short generic names (my, self, next, link, const, try) use relevance 0 so they do not skew auto-detection. configure and property are left out, as the issue asked. A markup test covers the new commands, including namespaced forms.

Checklist

• Added markup tests, or they don't apply here because...
• I have read and followed our AI-assisted contributions policy (human review, no slop)

Assisted-by: Grok 4.7 (high)