Demurrage for Agent Resource Holds: price the hold, not just the use

The tools mostly have clearly distinct purposes: account status, registration, querying, evaluation, release, and capsule restoration. The closest overlap is between query_hold and evaluate_hold, but the descriptions distinguish querying tariff information from performing an evaluation with accrual, debit, and snapshot-release behavior.

All tools use a consistent demurrage_ prefix and mostly follow a verb_noun pattern such as evaluate_hold, query_hold, register_hold, release_hold, and restore_capsule. demurrage_account is the minor deviation because it is noun-only rather than verb_noun.

Six tools is well-scoped for this domain and each tool appears to earn its place across account management, hold lifecycle, tariff evaluation, and capsule restoration. The surface is neither thin nor bloated.

The set covers the core hold lifecycle: registration, querying, evaluation, release, restoration from capsules, and account status. A notable minor gap is the absence of a list-active-holds or discovery operation, which may make hold_id-dependent tools harder to use without external knowledge.