(MOT-3873) feat: native code mode for the harness#423

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Commits on Jul 5, 2026

feat(shell): add str_replace op and coder::context workspace snapshot
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feat(harness): code mode — native coding toolset, env block, coding identity
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feat(console): code mode in the chat composer
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fix(shell): coder::context resolves the fs_scope root, not the jail primary
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feat(harness): code prompt — environment block is pre-fetched, skip redundant coder::context
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feat(shell): coder::apply-patch — V4A whole-patch applier
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feat(shell): coder::worktree-add / coder::worktree-remove
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feat(harness): worktree-isolated spawns + GPT-family code prompt
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feat(approval-gate): auto-mode trust for the read-only coder surface
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feat(shell): post_write_checks — report-only diagnostics after coder writes
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chore(shell): clippy — redundant closures in worktree handlers
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fix(harness): worktree-isolated children are told to commit their work
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Commits on Jul 6, 2026