[codex] improve xhs and non-video workflow usability

[haoabcde]

Summary

• add XHS starter rubrics and a post template for users who pick short-text + xhs
• add a maintainer verification script for install lists, shell/python syntax, diff_pct, and XHS writing rules
• make non-video flows easier to use by preventing cheat-shoot from being used for article/XHS publishing
• expand .gitignore for local agent state, runtime content artifacts, and non-video project outputs

Scope guard

• no user content/output files are included
• no khazix language-style skill or private style examples are included
• this PR keeps the upstream flat repository structure

Validation

• bash tools/verify-package.sh
• git diff --cached --check
• staged leak checks for content directories and khazix style references

[Jooonnn]

注意到这个 PR 还是 draft，等你标 ready 再合。先 review 了一下，两个建议（非阻塞）：

1. cold-start 小红书用户走不到新 starter：cheat-init/SKILL.md 的 starter 选择规则里，路由到 xhs-post-zero.md 要求 content_form=short-text 且 enabled_perf_adapters 含 xhs-explore。但 enabled_perf_adapters 只对"发过内容"(Q2=b)的用户填充；真正的 cold-start 小红书用户答 Q2=a，enabled_perf_adapters=[]，于是落到 else 分支拿到 opinion-video-zero.md 占位——也就是新写的 cold-start 小红书 rubric 恰恰对它的目标用户不可达。cheat-seed（skills/cheat-seed/SKILL.md）是用"用户明确要小红书"做了出口，建议 cheat-init 也加同样的逃生通道。
2. verify 脚本漏覆盖：tools/verify-package.sh 的 shell 语法检查 find 只覆盖 adapters/perf-data/*/run.sh，adapters/script-extraction/whisper/run.sh 被静默排除——那里的语法错误会漏检。建议放宽 glob。

其余（scope guard 无内容泄漏、set -uo pipefail 不带 -e 的设计、starter rubric 结构）都没问题。