README: drop the interpreter blurb from the Interfaces section

[thedavidmeister]

Closes #124

## Interfaces opened with ~20 lines about calling interpreters: what can go
wrong when "any" contract calls one, metamorphic contracts, indexer ABI
discoverability, trusting contracts at the bytecode level, and a pointer to
rain.extrospection. None of it is about this repo. src/ is
ICloneableV2, ICloneableFactoryV4, LibICloneableFactoryV4 and
deprecated/; nothing here calls, imports or names an interpreter — after this
deletion grep -c interpret README.md is 0, and it was 1 only because of that
passage.

It is carryover from a shared blurb, and it sat between the section heading and
the actual interface descriptions, so a reader arriving for the design rationale
of ICloneableV2 / ICloneableFactoryV4 read a different problem domain first.

Deleted, keeping Contains interfaces for working with Rain factories. and the
interface list that follows. Nothing is reworded and nothing is added.

QA

• Discriminating tests: n/a - README prose, and tests never assert README text.
• Mutations applied: n/a - no src/ or test/ change, so there is no behaviour
  to mutate.
• Oracle: the repo's own contents. src/ holds three current interfaces plus
  deprecated/, and no file in the tree references an interpreter or
  rain.extrospection once this passage is gone.
• Category check: the issue asks for (A) the interpreter passage at 46-64;
  covered A as one contiguous deletion, because the bullets at 52-55 and 57-61
  and the rain.extrospection pointer at 63-64 only make sense as that
  passage's continuation. The rest of the section was read rather than assumed:
  the ## Interfaces line, the one-line summary and the interface list are all
  about this repo and are left alone. The open-salt paraphrase further down the
  same list is a different defect, [F39] [LOW] README.md paraphrases the ICloneableFactoryV4 open-salt spec and has already fallen behind it: it still names tx.origin as the one residual the address cannot fix #143's, and is not touched here.

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