Add small disclosure about syntax migration & scan

Author: schemen

README.md

@@ -74,6 +74,8 @@ You can migrate existing notes:
 
 Each migration opens a review modal listing matching files with counts. Deselect any
 files you want to skip, then confirm the migration (it edits your files).
+Vault-wide Markdown file scanning is used only for these user-initiated migrations, not during
+normal rendering or autocomplete.
 
 ## Autocomplete
 Type the configured opener (`[%` or `{{`) to see a dropdown of frontmatter keys

src/migration-modal.ts

@@ -40,6 +40,9 @@ export class MigrationModal extends Modal {
 				? "Finds backticked `=this.key` and converts to the selected syntax format."
 				: "Finds other syntax formats and converts them to the selected syntax format.",
 		});
+		contentEl.createEl("p", {
+			text: "This scans Markdown files in your vault only after you open this review, and only edits files you confirm.",
+		});
 
 		this.listEl = contentEl.createDiv({cls: "embed-metadata-migration-list"});
 		this.listEl.setText("Scanning files...");