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Sprint: C Parity Fixes (Round 2)

9 gaps between Rust and C original. All must match C behavior exactly.

P1: deplete() — capitol loss depletion

C: original/misc.c:783, called from updsectors() at original/update.c:1004
When nation has no capitol (lost/occupied), disband PDEPLETE% of armies, all monsters, scatter people, reduce gold
Add to conquer-engine/src/economy.rs in updsectors() per-nation loop

P2: MEETNTN auto-diplomacy in updsectors

C: original/update.c:978-988 — check adjacent sectors within MEETNTN=2 range, call newdip() when nations first meet
Add to updsectors() in the per-sector loop

P3: ROADS movement penalty

C: original/update.c:1240-1243 — in updmil(), if nation has ROADS power and army is in enemy territory: smove>7 → -4, else smove>4 → cap at 4
Add to updmil() after movement calculation

P4: move_people() — proper attractiveness-based migration

C: original/update.c:1557-1622 — uses attr[][] grid from attract() function (update.c:135)
Replace simplified neighbor-diffusion with proper C algorithm
C attract() at update.c:135 calculates attractiveness per sector

P5: Group movement (GENERAL)

C: original/update.c:1260-1275 — groups move at slowest unit speed +2; GENERAL with no followers → DEFEND
Add to updmil() after individual army movement calc

P6: Siege validation in updmil

C: original/update.c:1155-1200 + 1296-1340 — count attackers vs defenders (siege units 3x), SIEGED status, movement removal
Add siege validation pass to updmil()

P7: Navy storms

C: original/update.c:1278-1310 — PSTORM% chance to sink fleet, crewless ship destruction
Add to updmil() navy loop

P8: PC leader movement halved

C: original/update.c:1250 — if(ispc && occ[AX][AY]==0) A->smove /= 2
PC armies not near a leader get halved movement
Add to updmil() in maintenance section

P9: attract() for move_people

C: original/update.c:135-244 — full sector attractiveness for civilian migration
Port attract() and use it in move_people()