Make advanced grind AI production-ready for live AC

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Summary

• Switch scripts/grind.lua to the advanced strategy AI (survive, rest, grind, loot, melee, single class spec) with level-1 GM combat prep.
• Fix Charge: stop+cast while closing, server relocate snaps movement (no rubber-band home), do not abort chase on failed Charge casts.
• Gate warrior casts on rage costs; block re-casts after CAST_FAILED NO_POWER (85).
• Profile YAML loads bot_mode / flags correctly; --lua-script forces Lua mode.
• Targeting skips critters; warriors no longer enable engage_ranged (which froze bots staring from 8–25y).
• Stance is applied once at prep — no periodic Battle Stance spam.

Test plan

• go test ./bot/ -run 'TestAdvanced|TestCharge|TestCastCharge|TestSummon'
• Live AC: ./azghost --profile local-ac cli --char-name ChargeBot --class 1 --race 1 --lua-script scripts/grind.lua --delete-existing-chars --duration 55s
  • Observed Charge + Server relocate, multiple kills, no stance spam every 15s
• Manual: low-level warrior grind in Elwynn — Charge openers, melee close, rest on low HP, no NO_POWER spam

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Addressed in fe8179f: rest/loot priority, combat thrash, relocate race, NO_POWER gate, grind_chase wiring.

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Addressed all review threads in fe8179f:

• rest_if_low arms rest_until before yielding to loot
• survive_low_health no longer stop_moving in combat
• applySelfServerRelocate pose writes go through moveMu and reassert after callback
• CanCast uses Bot.IsSpellReady (noPowerUntil shared)
• removed optimistic warrior mark_nopower
• grind_chase wired into select_grind_target / engage_melee

All six threads resolved. CI should re-run on the new commit.