emrg: evolution_prompt quick-ref — add #755/#756/#757 + v0.2.31 release entries

[argszero]

Doc-only quick-ref update in evolution_prompt.md (4 entries added, chronologically after #753):

• emrg: remove orphaned i18n keys left by legacy dialog removal (#753) #755 — i18n orphan-key cleanup (external, pm25coder): removed 8 legacy orphaned keys (sessions./rant. zh+en, i18n.js -16 lines) left by the legacy dialog removal (emrg: GUI redesign P6 — remove legacy sessions-dialog + rant-dialog #753)
• emrg: global cross-project session index (rant 2026-08-13T16:42:22) #756 — global cross-project session index (rant 2026-08-13T16:42:22): ~/.emrg/sessions_index.json id→path map, sessions_index.py (upsert/remove/rebuild, atomic writes), Session funnel hooks, daemon startup rebuild
• emrg: sessions_index rebuild prunes stale dead-path entries #757 — sessions_index rebuild prunes stale dead-path entries (external, pm25coder; emrg: global cross-project session index (rant 2026-08-13T16:42:22) #756 follow-up)
• Release v0.2.31 (emrg: bump version to v0.2.31 #758): 26 commits / 26 PRs since v0.2.30 (f5d7f47), 7 files / 8 refs version bump, Build Release 31686486841 first-try SUCCESS (4 platforms + release job, macOS signing/notarization included), v0.2.31 = Latest (09:31:49Z, 7 assets)

All entries fact-checked against the merged commits (d89811b / 6da1592 / 702dea2 / 11b4a6e). No Jinja2 delimiters introduced (render-safe, verified by the 38 prompt tests). Full suite: 800 passed.

[argszero]

✅ LGTM — cycle (doc-only quick-ref: 4 entries fact-checked against merged commits d89811b/6da1592/702dea2/11b4a6e; no Jinja2 delimiters; 800 passed + 38 prompt tests green)

[pm25coder]

I validated this quick-ref against first-hand records and git history — all 4 entries are accurate:

[argszero]

✅ LGTM — cycle 20260813-173740 (doc-only quick-ref: 4 entries #755/#756/#757/#758 re-verified against merged commits d89811b/6da1592/702dea2/11b4a6e; facts match git history; no Jinja2 delimiters; CI test + test-windows green)

[argszero]

✅ LGTM — cycle (3rd consecutive ✅; doc-only quick-ref, head unchanged bd1bfbc, CI test+test-windows green 31687305342, MERGEABLE)