• Adds the DevLoop Agent tool layer (CommonJS) under server/src/tools/devloop:
    - _errors.js / _sandbox.js — shared infra (3 error classes + path allow-list w/ {unitId})
    - tool-registry.js — loadAllTools / dispatch / listToolNames / getDevLoopTools
    - persistence-tools.js (5) — write_todolist · update_todo_item · update_runtime_state · timeline_append · record_memory
    - doc-tools.js (12) — bootstrap_prd_site · bootstrap_sdd_site · write_chapter · write_mvcp_page · archive_doc · diff_html · diff_units · echo_diff · update_search_index · validate_prd_site · validate_sdd_consistency · hash_contract
    - coder-tools.js (3) — contract_bridge · sandbox_check · append_coder_log (retry fields required)
    - tester-tools.js (5) — parse_vitest · hint_builder · bug_open · bug_transition · bug_list
    - integrator-tools.js (6) — port_picker · spawn_units · health_wait · run_case · parse_placeholder · collect_stderr
    - triager-tools.js (4) — extract_evidence · category_classifier · diff_contract_vs_impl · find_similar_bug
    - bash-json-guard.js — preExecute hook blocking inline JSON in Bash (CLAUDE.md L91-99)
    
    Total: 35 callable devloop tools.
    
    Tests: 88 cases across 9 files, all passing; combined with P0.0 services
    suite the project now has 159 green tests.
    
    Specs:
    - docs/prd/newfunction/_spec/arch-tool-registry.md
    - docs/prd/newfunction/_spec/agents-{pm,architect,coder,tester,integrator,triager}.md
    
    Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
    yibo authored
     
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