The changes add dynamic, semantic argument completion for Tcl
commands and snippet support.
- Introduces DynamicCompletionKind, TclArgumentCompletion, and dynamic rules
for Tcl to provide variable, procedure, namespace, and path suggestions.
- Adds snippet-backed commands and arguments for Tcl blocks and paths.
- Refactors tcl_argument_completion and updates the LSP to use dynamic path,
variable, and namespace completions with snippet kinds.
- Introduced a Tcl command-aware completion engine and wired to LSP.
- Added a new module with Tcl commands, options, and contextual matching.
- Updated completion to favor command-aware items and args.
Christoph Brandau