Multi-locale phone validator, expanded corpora, and all-validator round-trip + operator-algebra coverage (#288)HEADmain

Completes the remaining non-docs library items on the v1.0.0 milestone:
a genuinely multi-locale `phone` validator, real per-locale corpus
hardening, and an end-to-end coverage layer that exercises every shipped
validator and the operator algebra.

## Multi-locale phone (#154)
`phone` is rebuilt as a table-driven multi-locale model: an optional `+`
or `00` prefix, two to eight digit groups of one to four digits each,
single-character space/dot/dash separators, and any group optionally
parenthesised. It now accepts the display forms it previously missed —
leading and inline parenthesised area codes such as `(555) 123-4567` and
`+44 (0)20 7946 0958`, and variable national grouping from three-group
North American through five-group French — plus two-to-six-digit service
and short codes. Doubled separators, bare prefixes, and letters are
still rejected. The corpus grows from a seven-string smoke test to
twenty-one real numbers across eleven locales with ten adversarial
rejects.

## Postal locale coverage (#155)
Multi-locale postal codes are delivered by the existing `postal`
validator; this pins it down with a twenty-code corpus spanning North
America, Europe, Asia, and Oceania (including alphanumeric UK, Irish,
Canadian, and Dutch shapes) with ten adversarial rejects. `zip_code`
stays deliberately US-scoped, with `postal` as its locale-complete
counterpart.

## Validator snapshots (#191)
Every per-validator migration to a callable `Pattern` has landed, so
regenerating the built-in snapshot corpus is a no-op apart from
`phone`'s new emitted shape, which is refreshed here.

## End-to-end coverage of every construct (#258)
- Every registered library validator now round-trips through both dict
and JSON serialization with its emitted regex preserved — a property
test over the full validator set, alongside the existing compiled-source
invariant.
- The operator algebra (`+`, `|`, and `.use()`) is asserted identical to
its fluent-chain equivalent across every character-class constant, at
both the emitted-string and compiled-matcher level, so the two surfaces
can never drift.
- Hardening corpora expand beyond the smoke-test handful to `phone`,
`postal`, `semver`, `slug`, `hostname`, `port`, `isbn`, and `vin`, each
with real-world accepts and adversarial rejects.

Closes #154, Closes #155, Closes #191, Closes #258

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