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Revive PVML-in-browser pathway: full 4-chapter support, bigint/complex numbers, spread/rest args, parser group (#236)

* revamping equality and identity

* wording improved

* taking care of the PVML aspects of this spec change

* Restrict the native Pynter pathway to Python §3, and free up EQP/NEQP for it

Pynter's target is Python (SICPy) §3 specifically (see pynter/README.md,
updated separately in the pynter repo) -- it has no runtime notion of
"chapter" to gate narrower/wider rules for §1/§2/§4, so it implements
§3's semantics unconditionally. Enforce that pathway boundary instead
of silently running other chapters with the wrong rules:

- runCodePvmlDetailed (pvml-runner.ts) and generateNativePynterTestCases
  (tests/utils.ts) now throw a clear error for variant !== 3.
- PyPvmlPynterEvaluator's hardcoded chapter (previously 4, inconsistent
  with Pynter's actual scope) is now 3.
- Every native-Pynter test call site across the suite now declares §3.
  Most are still-valid §3 programs nominally written for another
  chapter (linked-list/stream/pairmutator/list/parser-stdlib), so only
  the declared variant changes. One exception: stdlib.test.ts's
  "Chapter 1 Builtins" miscTests asserts §1-specific restrictions (bool/
  function excluded from ==/!=/ordering, list literals rejected) that
  are genuinely false at §3, not just untested there -- that sweep is
  removed rather than mislabeled.
- operator-conformance-pynter.test.ts's chapter loop is now just [3],
  matching its now-single-chapter scope.

Renumbered EQP/NEQP (added for is/is not's pointer-identity semantics,
distinct from ==/!=' structural equality) from 89/90 down to 85/86, so
PYNTER_OPCODE_MAX can become a single contiguous threshold (0x56) now
that Pynter implements them -- the prior gap (85-88 unimplemented,
89-90 implemented) couldn't be expressed as one cutoff without also
wrongly admitting the still-unimplemented FLOORDIVG/NEWITER/FOR_ITER.

Verified via yarn pynter:report against ... (continued)

3336 of 4409 branches covered (75.66%)

Branch coverage included in aggregate %.

7287 of 8704 relevant lines covered (83.72%)

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