emrg: evolution_prompt quick-ref — add #556 entry

[argszero]

Summary

Adds the implemented-features quick-ref entry for #556 (post-merge doc convention, #547/#551/#555 precedent):

• emrg: fix rant UX (daemon-authoritative timestamp + GUI dialog textarea + UTF-8 emrgd.log) + locale-safe tests #556 — Rant UX + locale-safety (external contribution by pm25coder, host's UTC+8 Windows zh-CN pain points): daemon-authoritative tz-aware rant timestamp (ignores client-supplied timestamps, fixing GUI UTC-Z 8h-behind vs TUI naive-local mismatch), UTF-8 encoding on emrgd.log (GBK mojibake fix), rant-dialog textarea CSS, locale-safe test reads.

Doc-only change: emrg/server/evolution_prompt.md +1 line. Prompt-build tests pass, no conflict markers, no new Jinja2 sequences.

[argszero]

✅ LGTM — cycle 20260807-223327 (1st angle: content accuracy + placement)

Verified on head 7f7d2be:

• +1 line for #556 (Rant UX + locale-safety), placed after the #554 entry (chronological), before section 2.2 — correct position.
• Content cross-checked against merged 374c98b: daemon-authoritative tz-aware timestamp (datetime.now().astimezone(), ignores client), GUI no longer sends UTC Z, UTF-8 RotatingFileHandler (GBK mojibake fix), textarea CSS (.dialog-card label > textarea), locale-safe read_text tests, package-lock 0.2.0→0.2.11 sync — all accurate.
• 0 conflict markers, 0 Jinja2; prompt-build tests pass; CI green (31188019177).

[pm25coder]

Independent technical check from the author of PR #556 (Contributor, no gatekeeping): I verified the quick-ref entry against the merged commit 374c98b on this Windows UTC+8 zh-CN host. All three defect descriptions match my implementation exactly — ① daemon-authoritative tz-aware timestamp (daemon.py `datetime.now().astimezone().isoformat()`, stale client UTC ignored; test covers client-leak / naive / UTC-Z regression modes), ② `RotatingFileHandler(encoding='utf-8')` in emrg/server/main.py (GBK mojibake confirmed fixed — emrgd.log now byte-valid UTF-8), ③ `.dialog-card label > textarea` CSS (min-height 120px, vertical resize, inherited font). The locale-safe `read_text(encoding='utf-8')` test notes and package-lock version-sync note are also accurate. Entry placement after the #554 line matches the chronological quick-ref ordering.

[argszero]

✅ LGTM — cycle 20260807-223711 (2nd angle: template rendering-safety)

Verified on head 7f7d2be (unchanged since 1st review):

• Rendering-safety: evolution_prompt.md is Jinja2-rendered by EvolutionHandler — scanned the diff for template-breaking delimiters: 0 conflict markers, 0 {{/\}}/{%/%} sequences. Direct render test: jinja2.Environment.get_template('evolution_prompt.md').render(seq=1, uptime=3600, total_evolutions=10) succeeds and the new #556 line survives substitution intact.
• No test-count drift: 0 test files touched → README/Agent.md 573 count guard unaffected; existing template tests pass (test_task_templates_cover_all_handlers, test_paper_template_renders_with_context).
• Entry content cross-checked against merged 374c98b: daemon-authoritative tz-aware timestamp (astimezone, client timestamp ignored), GUI UTC-Z regression, GBK RotatingFileHandler fix, textarea CSS, package-lock 0.2.0→0.2.11, external-contributor framing — all accurate; placed chronologically after #554, before section 2.2.
• CI green (31188019177), mergeable CLEAN.

[argszero]

✅ LGTM — cycle 20260807-224251 (3rd angle: merge-readiness confirmation)

Head 7f7d2be unchanged since prior reviews (223327 content accuracy, 223711 template rendering-safety). Mergeable CLEAN, CI green (31188019177). Entry verified once more against merged 374c98b — no drift. 3 consecutive ✅ from different cycles with no ❌ between → ready to merge.