Add v1.7.2.6 roadmap entry: constant & helper dedup

[Wewoc]

Tracks six confirmed cases of duplicated (rather than shared) code found while reviewing cross-file coherence: three lazy-import helpers in panel_mcp.py/panel_chat.py, _date_range() in three modules, ensure_build_venv() in two build scripts, and two constants (QUALITY_RANK/_QUALITY_RANK, INFO_INCLUDE_T2/T3) duplicated under different names.

Claude-Session: https://claude.ai/code/session_019aYRcQa8o7ua4C2V6fHoug

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Reviewing files that changed from the base of the PR and between b44e018 and 7e23966.

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• src/docs/ROADMAP.md

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