Use Chinese for analyst reports

Request:
- Make analyst reports Chinese by default and record the rule in the analyst skill.

Changes:
- Add a Simplified Chinese default-language rule to the analyst skill.
- Update the single-IPO report generator to emit Chinese Markdown sections, labels, actions, risks, triggers, and exit plans.
- Preserve ticker symbols, stage codes, rule ids, score buckets, and source paths as machine-readable identifiers.
- Regenerate the 06106 T0 report in Chinese.
- Document the Chinese report default in README and the rule change log.

Verification:
- Ran py_compile for scripts/generate_ipo_report.py.
- Generated a 06106 dry-run report and checked Chinese section headings.
- Regenerated reports/2026-06-15_06106_T0_prospectus_analysis.md.
- Ran git diff --check.

Next useful context:
- Future analyst prediction and review reports should be written in Simplified Chinese unless the user explicitly requests another language.

rules/rule_change_log.md

@@ -1,5 +1,28 @@
 # Rule Change Log
 
+## 2026-06-15 - Use Chinese for analyst reports
+
+Request:
+
+- Make analyst reports Chinese by default and record the rule in the analyst skill.
+
+Change:
+
+- Added a Simplified Chinese default language rule to the analyst skill.
+- Updated the single-ticker report generator to write Chinese Markdown reports while preserving ticker symbols, stage codes, rule ids, score buckets, and source paths as machine-readable identifiers.
+- Regenerated the 06106 T0 report in Chinese.
+- Documented the Chinese report default in README.
+
+Rationale:
+
+- The analysis workflow is intended for Chinese-language IPO subscription decisions, while project identifiers still need to remain stable for scripts and audits.
+
+Verification:
+
+- Generated a 06106 dry-run report and checked the Chinese sections.
+- Regenerated `reports/2026-06-15_06106_T0_prospectus_analysis.md`.
+- Ran py_compile for the report generator and git diff --check.
+
 ## 2026-06-15 - Add concrete stage dates to reports
 
 Request: