Harden task board and specs for weaker coding agents

- 06-tasks: add per-task detail sheets for Phase 0/1 (concrete init
  commands, BLOCKED preconditions, verification commands with expected
  results) and a constraint/verification quick table for Phase 2/3;
  replace subjective acceptance wording with checkable items
- 04-architecture: promote 3.4 to an authoritative filter-param
  contract (names, values, AND combination, invalid-value handling);
  add required/optional/default field annex with 0-5 validators to
  3.3; state AiCodingScore is not a model in MVP; record structure
  decision (keep wagtail-start home/search apps, business models in
  new core app, no Dockerfile)
- 03-tech-stack: add version-pinning policy row for T-001
- routes/02-requirements: point filter wording back to the 3.4
  contract instead of maintaining copies
- T-104: human-input boundary - seed projects, scores and verdicts
  must be user-confirmed; BLOCKED without a confirmed list
- current-state snapshot updated; maintenance record appended to
  progress.md

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

docs/routes.md

@@ -37,7 +37,7 @@
 
 - 展示所有已发布骨架项目。
 - 支持按语言、框架、数据库、AI 分数、关键词筛选。
-- 筛选条件体现在 URL 查询参数中。
+- 筛选条件体现在 URL 查询参数中；参数名、取值和组合规则以 [`04-architecture.md`](04-architecture.md) §3.4 契约表为唯一权威，本文不重复维护。
 - 展示当前筛选条件和清除筛选入口。
 
 ### 项目详情页