refactor(consult): chat binds the method's truth boundaries, not the engine manual (BUG-1256 step 2)

The method block bound into every chat turn quoted most of SKILL.md (benchmark
scores, CLI flags, oracle queues, file paths) plus the shared method, whose
output contract asks for JSON verdicts, A/B/C/D confidence, audit tables, raw
data and web verification - the opposite of the chat shape. Chat now quotes
only the truth-boundary sections and adds CHAT_METHOD_BOUNDARIES for the
limits from the dropped sections it still has to keep. SKILL.md and the shared
method file are unchanged for reports and skill_read.

Natal system prompt 55,242 -> 26,591 characters. DeepSeek A/B on public
golden charts (flash 10 questions): input 24,560 -> 14,025 tokens, 37.8 ->
30.3 s, no regression in automatic checks or reading; a high-rigor request
still says plainly that no external check was done. Full suite 4970 / fail
24, identical to b8385adb; build keeps / Static.

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

docs/tasks/README.md

@@ -429,3 +429,4 @@
 | —（直接执行，无任务书） | `PROGRESS-consult-readable-20261006.md` | **回答铺满一行、输出不抖、不念分析清单**（10-06 真机截图）：答案正文去 `text-wrap: pretty`（WebKit 整段等长 + 逐字重排，BUG-1252）；清单开头写明只用于分析、婚恋三层改生活说法、字段白话对照、括号最多两条（BUG-1253） | 已验收 | Claude 直接执行；真机清单 `docs/testing/consult-readable-20261006.md` 待产品 |
 | —（直接执行，无任务书） | —（记录在 BUG-1254） | **门禁偶发红：数据库测试排队等槽位超时**：46 个 fixture 文件抢 2 个槽位、固定等 5 分钟，排在后面的随机失败；改为槽位易手即续期、连续 10 分钟无进展才失败（BUG-1254） | 已验收 | Claude 直接执行；门禁实际效果待看 |
 | —（直接执行，无任务书） | —（记录在 BUG-1255） | **回答口吻改知心姐姐、放开读心**（10-07 产品决定）：人设统一；读心守三条（先答再读、可能/多半一句、当事人要有依据且未受冲）；删冲突的旧规矩。推翻 BUG-1070 读心部分 | 已验收 | Claude 直接执行；真机清单 `docs/testing/consult-voice-sister-20261007.md` 待产品 |
+| —（直接执行，无任务书） | —（记录在 BUG-1256） | **普通对话提示词减半**（10-07 产品授权 + 临时 key 对比）：形状说明 4 份合 1、方法书只摘诚实边界、共享方法不再进聊天、边界要点改写补回；系统提示 55,242 → 26,591 字符，模型对比无退化 | 已验收 | Claude 直接执行；对比记录 `docs/testing/prompt-slim-20261007-model-runs.md` |