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/02-requirements.md

@@ -56,7 +56,7 @@
 
 - **首页与场景导航**：访问 `/` 时能看到场景入口、推荐项目区和最新文章入口。
 - **骨架项目列表**：访问场景页时能看到该场景下已发布项目；无项目时显示空状态。
-- **筛选与基础搜索**：选择语言或框架筛选后，列表只展示匹配项目；筛选条件可被 URL 表示。
+- **筛选与基础搜索**：选择语言或框架筛选后，列表只展示匹配项目；筛选条件可被 URL 表示（参数契约见 [`04-architecture.md`](04-architecture.md) §3.4）。
 - **骨架详情页**：详情页展示名称、简介、官网 / GitHub 链接、技术栈、适用场景、不适用场景、AI 友好度评分、维护状态和推荐理由。
 - **后台内容管理**：管理员能在 Wagtail 后台新增项目、分类、语言、框架和评分，并发布后在前台可见。
 - **SEO 基础**：核心公开页面有稳定 slug、页面标题、meta description，并可生成 sitemap。