Narayana Dasha is Parashara's rashi-based dasha system, complementary to
Vimshottari (nakshatra-based). Algorithm: start from Lagna, each sign's
dasha years = count from the sign to its lord's sign (zodiacal order).
Implementation:
- scripts/narayana_dasha.py: core calculation module
- calc_narayana_mahadasha(): 12-sign sequence from Lagna
- calc_narayana_antardasha(): sub-periods within each MD
- get_current_narayana_dasha(): locate current period by age
- scripts/cmd_narayana_dasha.py: CLI subcommand
- jyotish_engine.py: Step 4.13 in full-reading + narayana-dasha subparser
Verified with Leo Asc chart: total cycle 88 years, current Sagittarius MD
(31-38 yrs, 5H/creativity) complements Vimshottari Saturn MD.
Files: +2 new (narayana_dasha.py, cmd_narayana_dasha.py), +4 modified
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