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feat: translate x-kubernetes-validations (CEL) into KCL check rules (fixes #22) (#161)

* feat: translate x-kubernetes-validations (CEL) into KCL check rules (fixes #22)

Adds a CEL -> KCL translator that converts each rule in
`x-kubernetes-validations` into a KCL boolean expression inside the
generated schema's `check:` block. The original message is preserved
as a KCL comment so operators still see the validation intent in the
output.

Supported CEL constructs (the subset commonly used by CRDs):
  * literals (int, float, string, bool)
  * identifiers, field access (`self.foo.bar`), indexing
  * comparisons and logical operators (`&&` -> and, `||` -> or, `!` -> not)
  * arithmetic
  * function calls: size -> len, matches -> _regex_match, startsWith,
    endsWith, has
  * higher-order: all -> `all v in xs { ... }`,
    exists -> `any v in xs { ... }`,
    exists_one -> `sum([1 for v in xs if P]) == 1`
  * ternary `a ? b : c` -> `(b) if (a) else (c)`

Unsupported constructs (e.g. `duration()`, `isURL()`) are skipped with
a `[WARN]` and the rule is omitted so generated KCL remains compilable.

Files:
  * cel.go / cel_test.go: tokenizer, parser, AST, code generator, tests
  * k8s_validations.go: extracts and translates the extension
  * structs.go: new CheckExpr / sharedValidations.CheckExprs
  * model.go: wires extractK8sValidations into schemaValidations
  * templates/schemabody.gotmpl: emits the translated `check:` block
  * types.go: xK8sValidations constant

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Claude <timi@noreply.anthropic.com>

* refactor: replace hand-rolled CEL parser with cel-go library

The previous cel.go (~580 LOC) implemented a hand-written lexer,
recursive-descent parser, and AST walker for CEL. cel-go already
provides all of these (lexer, parser, macro expansion, and a
protobuf AST), and re-implementing them meant we had to maintain our
own grammar alongside an actively-maintained upstream one.

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