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* fix(frontend): use code-aware stripLeakedSystemTags for all internal marker tags Replace the ad-hoc /<\/?memory>/g in ClipboardSafeStreamdown with a dedicated stripLeakedSystemTags() function in preprocess.ts that: - Covers all INTERNAL_MARKER_TAGS (<memory>, <system-reminder>, <current_date>, <uploaded_files>, <slash_skill_activation>) instead of only <memory> - Is code-aware: skips fenced code blocks (```) and indented code blocks (4-space indent), so user-written meta-discussions about the memory system are not silently stripped - Handles opening tags, closing tags, self-closing tags, and tags with attributes - Adds 15 unit tests covering all the above cases * fix(frontend): use marker-aware fence tracking in stripLeakedSystemTags The boolean insideFence toggle incorrectly closes a fence on any line matching 3+ backticks or tildes, regardless of the actual delimiter. This causes tags inside a tilde-fenced block containing a backtick sub-fence, or a 4-backtick block containing a 3-backtick sub-fence, to be silently stripped. Track the opening fence marker (character and run length) so that only a matching marker with at least the same length closes the fence. Adds 4 new test cases: - Tilde fence with inner backtick fence - 4-backtick fence with inner 3-backtick fence - Shorter tilde closing inside longer tilde fence - Tags stripped after real closing fence * fix(frontend): fix TypeScript strict errors in fence marker tracking - Use non-null assertion (!) on fenceMatch[1] (guaranteed by regex) - Use charAt(0) instead of [0] to avoid string | undefined type