v6.2.0: 全面技法宝库升级 — 16个新模块 + 12个文件优化

## 新增模块 (16个)
### P0 精度修复
- ashtakavarga: calc_prastara_av() + calc_sodhita_av()
- kakshya.py: Kakshya评分系统 (8区间×3.75°)
- shadbala.py: Sputa Drishti + Yuddha Bala

### P1 核心升级
- bhava_bala.py: 宫位三元力量 (jyotishganit MIT)
- pancha_mahapurusha.py: PMC完整检测含4层失效条件
- sade_sati.py: Sade Sati+Kantaka Shani
- sudarshana_chakra.py: 三参考点盘+收敛分析
- tajika.py: Sahams 7→36 + Tajika Yogas 10种
- birth_time_rectifier.py: 生时矫正

### P2 覆盖扩展
- kp_system.py: KP Sublord+ABCD Significator (diliprk/VedicAstro MIT)
- synastry.py: 16因子合盘36分制 (dashaflow MIT)
- muhurtha_election.py: 6活动选举 (dashaflow MIT)
- career_analysis.py: 结构化事业引擎
- relationship_analysis.py: 结构化感情引擎
- conditional_dashas.py: Dwisaptati+Shattrimsa+Dwadashottari
- divisional_charts_extended: D81/D108/D144
- remedies.py: 5类补救系统

## 修改文件
jaimini/dasha_calculator/shadbala/SKILL.md/COVERAGE_AUDIT等12个

## 开源复用: 4个MIT项目

references/open_source_sources/VedicAstro/StudyNotebooks/ReadMe.MD

@@ -0,0 +1,7 @@
+### Jupyter Notebooks for Study
+ This folder contains all the study notebooks for the purpose of learning and studying the `VedicAstro` python library.
+
+1. `VedicAstroStudy.ipynb` - This notebook contains information related to the construction of a basic birth chart using the `VedicAstro` library.
+2. `AscMotionStudy.ipynb` - This notebook contains a simple study of the Ascendant's speed of motion across the Zodiac.
+3. `HoraryChartStudy.ipynb` - This notebook contains the information for creating a horary chart (Hora) as per `Krishnamurthi Paddhati` (KP) system using the VedicAstro library.
+