refactor(semver): replace Constraint's OP_*/STR_OP_* with CmpOp

PHP's version_compare takes its operator as a string, so the shim's port
did too, and Constraint carried two families of operator constants plus
translation tables to convert between the string form and its own int
codes. Five copies of those tables had accumulated across Constraint,
CompilingMatcher and the plugin value bridge.

version_compare now takes a CmpOp, which makes an invalid operator
unrepresentable and removes the tables' reason to exist. Constraint
stores a CmpOp and keeps only the string parsing its constructor needs;
getOperator, compile and CompilingMatcher::match speak CmpOp as well.

PHP's OP_* numbering stays observable: a plugin reads the raw integer off
the Constraint object over RPC, so get_operator_constant and its new
inverse hold that 0..5 mapping.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

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