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_files.rs

@@ -1,6 +1,6 @@
-//! Phase 13: pure-function tests for the rename helper + the file-delete
+//! Pure-function tests for the rename helper + the file-delete
 //! command. The async `Backend::rename` end-to-end (with `read_or_open`
-//! hitting disk) is exercised by Phase 14+ integration but covered here
+//! hitting disk) is exercised by integration tests but covered here
 //! at the building-block level — same logic, no async client.
 
 use std::path::PathBuf;
@@ -95,7 +95,7 @@ async fn file_delete_returns_workspace_edit_with_delete_op() {
     //
     // Easier: shape the test as an integration test over the public
     // module surface — call `commands::execute` once we expose a thin
-    // builder. For Phase 13 we test the JSON-shaped contract using the
+    // builder. We test the JSON-shaped contract using the
     // edits module directly, since that's what `file_delete` returns.
     let uri = Url::parse("file:///tmp/note.wiki").unwrap();
     let mut b = nuwiki_lsp::edits::WorkspaceEditBuilder::new();