fix(consult): blank-line paragraphs, drop the H2 contract line, remove the assistant avatar

Acceptance fix for 28113fa0 (TASK-consult-conversational-answer-fix-20261006):
- F1: chat-answer-detail no longer pins 'Every H2 must start its own line'
  (first turns carry no H2), assertion change noted in three columns.
- F2: Good examples separate paragraphs with a blank line and the shape says
  so; .message p is pre-wrap, so a single newline only wraps.
- Product request: remove the assistant avatar on every surface (consult,
  rectification, onboarding); --assistant-content-inset back to 0px.

Full suite 4941 / fail 24, identical to baseline 86cafe68 minus a timing flake;
build keeps / Static; first-load gzip -0.1%.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017eEAG8HD3mm8gsKXgk8uU8

docs/testing/consult-conversational-answer-20261006.md

@@ -12,3 +12,6 @@
 | 6 | 新开对话，打「你好」 | 仍是一句寒暄 |
 | 7 | 用没填出生分钟的人物档案问事业 | 不点个人大运，不写月份，也没有标题 |
 | 8 | 盯第 1 步回答上方的进度栏，直到写完 | 首轮不出现「这周可以做什么」。结束后没有卡住的转圈项 |
+| 9 | 看第 1、2 步的回答 | 段落之间有空隙，不是一整块挤在一起的文字 |
+| 10 | 看普通对话、生时校正、首次引导三处的助手回答 | 回答左边没有圆形头像；回答文字、下面的追问按钮、校正页顶部时间轴左边对齐 |
+