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* fix: handle square brackets in agent names for mention parsing (#1991) The mention regex used [^\]]* to match labels, which broke when agent names contained square brackets (e.g. David[TF]). The ] inside the name caused the regex to stop matching prematurely, silently dropping the mention. Changes: - Backend (mention.go): Switch to .+? (non-greedy) anchored on ](mention:// to correctly match labels with brackets - Frontend (mention-extension.ts): Same regex fix in tokenizer, plus escape [ and ] in renderMarkdown to prevent creating ambiguous markdown syntax - Add comprehensive tests for ParseMentions covering bracket names Fixes #1991 * fix: add optional chaining for match group access Fixes TS2532: Object is possibly 'undefined' on match[1] when calling .replace() in the mention tokenizer. * fix: tighten mention tokenizer to reject ordinary Markdown links - Replace .+? with (?:\\.|[^\]])+ in start() and tokenize() regexes so the label cannot cross a ]( Markdown link boundary - Escaped brackets (\[ \]) from renderMarkdown() are still accepted - Add frontend tokenizer/serializer round-trip tests: - Plain mention - Escaped brackets (David[TF]) round-trip - Normal Markdown link + mention on same line (regression) - Multiple links before mention - Nested brackets (Bot[v2][beta]) - Issue mentions without @ prefix Addresses review feedback on #1992. * fix: add type assertions for tiptap MarkdownTokenizer interface in tests The tiptap MarkdownTokenizer type allows start to be string | function and tokenize to accept 3 arguments. Our extension always provides single-arg functions, so cast them for TypeScript satisfaction. Fixes CI typecheck failure in @multica/views package. * fix: cast renderMarkdown to single-arg shape and reset file modes to 0644