refactor: name the agree guard validateAgreeTolerances

[thedavidmeister]

agreeValidateTolerances read as "agree validate tolerances".

Its siblings — agreeSpread, agreeAnchor, agreeLimit — are noun phrases
naming what they return, so the agree prefix carries the association and the
rest of the name says what the value is. A verb does not fit that shape and
belongs at the front instead: validateAgreeTolerances reads as English and
still says whose tolerances it validates.

Private, so nothing outside the library refers to it.

QA

• Discriminating tests: n/a, and none would discriminate. The diff renames a
  private function at its declaration and its single call site. A rename that
  missed either would not compile, which is the check — and it does compile.
  The 33 tests in LibDecimalFloat.agree.t.sol pass unchanged, including the
  four guard tests that would fail if the call site had been dropped rather than
  renamed.
• Mutations applied: n/a. There is no behaviour to mutate; the only edit is
  an identifier. A mutant would either fail to compile or be the identical
  program.
• Oracle: the compiler. A private function's name is checked exhaustively at
  build time — an unrenamed reference is an error, and an unreferenced
  declaration is an unused-function warning, which -D warnings would fail on.
  Both pass.
• Category check: the category is "the guard's name does not match its
  siblings' shape". Covered: the one name. Nothing else is touched, and
  agreeSpread / agreeAnchor / agreeLimit keep their noun-phrase names
  because those already fit.

Verification

33 agree tests pass, forge lint -D warnings and forge fmt --check both exit
0.

🤖 Generated with Claude Code

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Reviewing files that changed from the base of the PR and between 7db9847 and a1f16d1.

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• src/lib/LibDecimalFloat.sol

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[thedavidmeister]

Closing: a private helper rename is not worth a PR, a release and a consumer bump.