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* feat(harness): introduce HarnessGuardMiddleware for pre-write syntax validation and anti-doom-loop - Add HarnessGuardMiddleware to intercept tool writes and validate .py (AST) and .json syntax before disk write - Add anti-doom-loop state machine detecting repeated error signatures (>=2) and A -> B -> A -> B oscillating loops - Inject targeted remediation hints directly into tool results - Add DynamicSkillRouter for zero-LLM JIT skill intent activation (<1ms) - Fully unit-tested with 25 passing test cases * fix(harness): address review findings on write tools, scoping, and content handling * fix(harness): offload async validation off-thread, support Command results, and harden parsing * fix(harness): address reviewer 1 feedback on scoping, assembly count, and non-blocking verification - Revert .gitignore to exclude out-of-scope graphify-out entry - Short-circuit syntax validation when block_on_syntax_error is false - Trim AGENTS.md rule chain to fit hard guidance budget (AG002) - Fix input_sanitization mock and update subagent middleware count expectation to 23 * fix(harness): preserve chunked write flow, normalize CRLF line endings, and guard error classification - Preserve append-in-chunks flow: use codeop to distinguish incomplete Python fragments from syntax errors, and handle premature EOF on chunked JSON arrays/objects - Reuse native _match_line_endings for str_replace to prevent CRLF line ending bypass - Check existing tool failure status before classifying error text to avoid misclassifying successful tool outputs - Add 4 regression tests covering chunked writes, CRLF replacement, and successful error-text reads * fix(harness): scope pre-write syntax validation to str_replace and preserve write_file semantics * fix(harness): make str_replace syntax check opt-in, allow progressive repair of invalid files, and clean up RFC docs * chore: align subagent middleware count and satisfy AG002 guidance budget --------- Co-authored-by: Yakyou7 <Yakyou7@users.noreply.github.com> Co-authored-by: Willem Jiang <willem.jiang@gmail.com>