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.

.codex/skills/analyst/SKILL.md

@@ -85,6 +85,7 @@ If the ticker is absent from `data/snapshots/analysis_model_v0_dataset.csv`, use
 
 Generated prediction reports must remain stage-safe:
 
+- Analyst Markdown reports should be written in Simplified Chinese by default, while preserving ticker symbols, stage codes, rule ids, source paths, and stable error tags in their original machine-readable form.
 - T0 reports use only prospectus-stage fields and T0 calibration.
 - T1 reports may add allotment demand fields and T1 calibration.
 - T2/D1 is the intended sell window; D5/D20/D60 returns are never shown as prediction inputs and are reserved for later review cards.
@@ -111,6 +112,11 @@ Every prediction card should include:
 - explicit T2/D1 sell discipline
 - source paths
 
+Language standard:
+
+- Write analyst reports, prediction cards, and review cards in Simplified Chinese by default.
+- Keep field identifiers, model versions, score buckets, ticker symbols, and source paths as code-formatted English identifiers when they are part of the project data contract.
+
 Every review card should include:
 
 - linked prediction card