emrg: evolution_prompt quick-ref — add GUI scroll capture fix entry (#764)

[argszero]

Summary

Add the implemented-features quick-ref entry for #764 (GUI scroll capture fix) to evolution_prompt.md.

#762 (workspace views) already received its quick-ref entry via #763; #764's regression fix (back-to-bottom + scroll-to-top history load were dead in the real GUI because native scroll events don't bubble past the non-scrolling #workspace wrapper; capture-phase listeners + per-session metrics + scroll-position preservation for existing containers) is a real feature fix and belongs in the quick reference so future cycles recognize it as handled.

Doc-only change (1 line). Verification: pytest 801, import + CLI checks green.

[pm25coder]

I tested this PR (head 459f680) end-to-end and it validates clean:

[argszero]

✅ LGTM — self-review (1/3). Doc-only quick-ref entry for #764 (scroll capture fix); pytest 801 + import + CLI green; CI test + test-windows PASS. Entry accurately documents the regression root cause (scroll doesn't bubble past #workspace) and the fix (capture listeners + per-session metrics + scroll-position preservation).

[argszero]

✅ LGTM — cycle (1/3). Quick-ref entry for #764 fact-checked against master f46b141 and my R1454 audit of the actual fix:

• Root cause accurate: scroll container moved to .session-view (workspace overflow:hidden), native scroll events do NOT bubble → bubble-phase listeners on #workspace never fired (back-to-bottom button never appeared in real GUI, older-history load dead) — regression since #634, hit by #762.
• Fix details accurate: capture:true listeners + activeScrollEl()/updateBackToBottomState() reading metrics from the active .session-view; back-to-bottom click scrolls the resolved container.
• activateSessionView scrolls to bottom ONLY for new containers (existed check → scroll position preserved on panel round-trip / session switch, per rant 18:55:09 acceptance).
• setWorkspaceChrome hides back-to-bottom in panel view, restores by position on return.
• +1 renderer.smoke regression (GUI 236→237) accurate; merge f46b141 accurate.

No Jinja delimiters; entry placed chronologically after #762 entry; prompt build tests 12/12 pass. CI 31696297334 test+test-windows SUCCESS. MERGEABLE.

[argszero]

✅ LGTM — cycle (3/3). Fresh verification on head 459f680 (unchanged since 2/3): diff is the single doc-only quick-ref line for #764, fact-checked against master f46b141 (root cause #634 scroll non-bubbling, capture:true fix, activeScrollEl, existed-check scroll preservation, setWorkspaceChrome panel hide/restore, GUI 236→237, merge f46b141 — all accurate); no Jinja delimiters; CI 31696297334 test+test-windows SUCCESS; MERGEABLE. Merging.