[Feat]: Make contract NatSpec platform-agnostic (remove runtime-specific references)

[sphamjoli]

Component

Other

Priority

P2

Summary

Several contracts describe their behaviour in NatSpec using terms specific to one runtime, so the
documentation is inaccurate wherever the contracts are deployed on a different EVM platform. The
contracts themselves are platform-agnostic; the NatSpec should be too.

Runtime-coupled wording currently in the NatSpec includes:

• pallet-revive and its store-deposit/contract-creation behaviour (for example "substrate Root
  cannot deploy a LabelStore under pallet-revive");
• "substrate Root" as the origin name, where "Root origin" alone is sufficient;
• foreign source symbols named directly: pallet_resources::UsernameReservationDuration,
  BaseLabel::is_valid_person, MinUsernameLength;
• "People Chain" as the source of a naming constraint;
• the upstream source path substrate/frame/revive/uapi/sol/ISystem.sol.

Desired outcome: NatSpec states the contract behaviour and constraints in direct, platform-agnostic
English, so a reader on any deployment target reads an accurate description.

Proposal

Rewrite the runtime-coupled NatSpec in the files below to describe the same behaviour without naming
a runtime, a foreign source symbol, or a specific chain. For example: "the mint origin cannot deploy
a LabelStore, so the label write is deferred" rather than naming the runtime; "the full-person
label rule (letters only)" rather than BaseLabel::is_valid_person; "a Root origin" rather than "a
substrate Root origin".

Files with runtime-coupled NatSpec (the contracts/external/revive/ interface is a genuine binding
to the System precompile and is out of scope):

• contracts/registrars/DotnsRegistrar.sol
• contracts/registrars/DotnsRegistrarController.sol
• contracts/registrars/IDotnsRegistrarController.sol
• contracts/pop/PopRules.sol
• contracts/pop/IPopRules.sol
• contracts/whitelist/DotnsNameWhitelist.sol
• contracts/whitelist/IDotnsNameWhitelist.sol
• contracts/utils/SystemUtils.sol
• contracts/utils/DotnsConstants.sol

Acceptance criteria

• No pallet, revive, or substrate reference remains in the NatSpec of the listed files.
• No foreign source symbol (pallet_resources::…, BaseLabel::…, MinUsernameLength) or
  chain name ("People Chain") remains in their NatSpec.
• The described behaviour is unchanged; only the wording is agnostic and direct.
• forge build passes.