fix(compliance, asset-token): resolve issues #305, #306, #308, #310

[ruthkadir93-hue]

closes #305
closes #306
closes #308
closes #310

• test(test(compliance): get_admin success path is untested #305): add get_admin success path test in compliance
• perf(perf(compliance): get_allowlist and prune_expired rescan every page ever allocated #306): skip empty pages in get_allowlist and prune_expired
• docs(compliance: remove_from_allowlist leaves permanently under-full pages #308): document fragmentation tradeoff in remove_from_allowlist
• test(test(asset-token): no test asserts get_metadata reflects all mutated fields #310): add get_metadata full-field mutation test in asset-token

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