README: point at the open-salt spec instead of restating it

[thedavidmeister]

Closes #143

README.md carried its own account of what the open-salt address does and does
not fix, and it had already fallen behind the NatSpec that CLAUDE.md names as
the spec. It read

The residual the address cannot fix — implementations MUST NOT read
tx.origin — …

definite and singular, while src/interface/ICloneableFactoryV4.sol lists two
MUSTs there: no tx.origin, and "The gas initialize is given MUST NOT select
state", the latter added by 48a0349, which touched that file alone. An
implementer reading the README as exhaustive keeps tx.origin out of
initialize, leaves a try/catch that defaults on out-of-gas, and ships the
hazard the second MUST exists to prevent.

The fix is to stop keeping a second copy rather than to sync this one: the
bullet now says what is repo-local — which interface declares the open-salt
pair, that it extends ICloneableFactoryV3, what the salt hashes — and points
at the NatSpec for what the address commits to, what it does not fix, and the
MUSTs that places on implementations. No restated MUST is left in README.md,
so there is nothing here that can drift again.

The deleted WHO/WHAT paragraph went with it: it was the same second copy of
ICloneableFactoryV4.sol:54-90, and it is the part a reader would trust as the
whole trade-off.

README.md is also #124's file, one section earlier. Each stands alone.

QA

• Discriminating tests: n/a - README prose, and tests never assert README text.
  The drift this PR removes is exactly the kind no test can catch, which is why
  the copy is removed rather than corrected.
• Mutations applied: n/a - no src/ or test/ change, so there is no behaviour
  to mutate.
• Oracle: the NatSpec itself at src/interface/ICloneableFactoryV4.sol:135-168,
  read against the README sentence, and git log --name-only 48a0349 for which
  files the second MUST landed in.
• Category check: the issue asks for (A) the stale tx.origin-as-sole-residual
  claim and (B) the hand-maintained paraphrase that produced it; covered A,B.
  The rest of the README was checked for the same shape: the ## Library
  section describes this repo's own files, the ### Legacy entries describe
  which interface superseded which, and neither restates a normative MUST, so
  neither is in scope.

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• README.md

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