Remove stale phase/spec references from code comments

Strip "Phase N", "SPEC §X.Y", and "v1.x" planning labels from comments
across the Rust crates and editor layers now that those tracking
artifacts are gone. Comments only — no logic, strings, or test names
touched.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

crates/nuwiki-lsp/tests/commands_tables.rs

@@ -1,4 +1,4 @@
-//! §13.1 Cluster B — table rewriters: `insert`, `align`, `moveColumn`.
+//! Cluster B — table rewriters: `insert`, `align`, `moveColumn`.
 
 use nuwiki_core::syntax::vimwiki::VimwikiSyntax;
 use nuwiki_core::syntax::SyntaxPlugin;