Add read-only industry tools (industry jobs, blueprints, mining ledger;
corp jobs + blueprints) and trade tools (contracts, own market orders;
corp contracts + orders). New charutil helper runs a fetcher over one or
all characters, with a corp variant that resolves each character's corp id.
account._run now reuses it.
27 tools total, 70 tests, coverage 91%. Closes#18 and #19; covers most of #20.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
