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/03-tech-stack.md

@@ -8,6 +8,7 @@
 | --- | --- | --- | --- |
 | CMS / Web 框架 | Wagtail + Django | 已定 | 内容模型、后台、页面、SEO、搜索和后续扩展都适合目录评测站。 |
 | Python | Python 3.12 | 已定 | Wagtail 当前支持 Python 3.12；部署环境更稳。 |
+| 版本钉死 | `requirements.txt` 按实际安装版本 pin | T-001 落实 | 初始化时安装 pip 当前稳定版 Wagtail，用 `pip show wagtail` 确认版本后写成 `wagtail==X.Y.Z`，并回写本表。 |
 | 数据库 | SQLite with JSON1 | 已定 | 开发和第一版上线成本低；MVP 写入少。 |
 | 后续数据库 | PostgreSQL | 条件触发 | 出现用户写入、高并发、后台多人编辑、锁冲突或会员功能后迁移。 |
 | 前端模板 | Django Templates / Wagtail Templates | 已定 | 第一版以内容站为主，避免引入前后端分离复杂度。 |