[codex] add territory judgement overlay

[wimi321]

Summary

Adds a KaTrain-inspired territory judgement mode to GoAgent so users can inspect ownership/territory directly on the board instead of only reading numeric KataGo output.

What Changed

• Preserves KataGo rootInfo.ownership and ownershipStdev in KataGoMoveAnalysis.
• Adds a reusable territory judgement model that converts ownership into black/white/unclear cells, region summaries, confidence, and lead text.
• Adds a premium board overlay with three display modes: heat, blocks, and marks.
• Adds a compact 形势判断 control with deepen action and a timeline summary chip.
• Wires territory judgement into the workbench and UI Gallery with localized labels.
• Adds contract tests for ownership parsing, board overlay wiring, workbench controls, and UI Gallery samples.
• Includes the already validated mouse-wheel replay contract for the winrate timeline.

User QA

Flow under test: UI Gallery -> switch territory display modes -> board overlay and timeline summary update without layout breakage.

Findings fixed during QA:

• On narrow viewports, the UI Gallery candidate tooltip overlapped the territory controls. Fixed by repositioning the tooltip below the board on small screens.
• On narrow viewports, the territory control could visually crowd the deepen button. Fixed by using compact spacing and hiding the confidence chip under small widths.
• Timeline territory summary initially rendered as a tall multi-row block. Fixed by adding a compact one-line summary chip for timeline placement.

Verification

• pnpm install --frozen-lockfile
• pnpm check
• pnpm check:teacher-quality
• Browser UI QA on http://127.0.0.1:4177/index.html?ui-gallery=1
  • Page identity verified.
  • Not blank.
  • No framework overlay.
  • Console errors/warnings: none relevant.
  • Heat / blocks / marks controls clicked and state verified.
  • Desktop screenshot captured.
  • 390x844 viewport screenshot captured after responsive fixes.

Notes

• No release artifacts, installer files, API keys, tokens, or website/design-concepts/ files are included.
• This PR does not change release versioning.