Remove model fields nothing populates or reads

[MariusVolkhart]

Why

norm.generator.Column, norm.generator.Query, norm.generator.Catalog, norm.generator.Schema,
and norm.generator.Identifier still carry fields from the sqlc/Wire-proto era. The JDBC analyzer
never assigns them and no generator code reads them, so every reader of the model has to work out
which properties are live. Two documentation locations still describe the proto pipeline that no
longer exists.

Out of scope, deliberately: Column.embedTable, the sqlc.embed() branch in
TypeRepository.buildTypeProjectionForQuery, getTypeProjectionForTable's columnOffset, and the
four *_embeds scenarios. Embed support is planned (README TODO); leave every trace of it alone.

Current state (verified by git grep over generator/src/main and all src/test trees)

Declared in generator/src/main/kotlin/norm/generator/Model.kt, never assigned by
norm.generator.JdbcAnalyzer or norm.generator.PgCatalogLoader, never read anywhere, never
named in any test:

Type	Field	Notes
Column	isNamedParam, isFuncCall, scope, tableAlias, isSqlcSlice, unsigned, length	The word unsigned appears in e2e-tests/.../PlainArrayE2ETest.kt; confirm it is prose, not the field
Query	insertIntoTable
Catalog	name, comment	Only defaultSchema and schemas are ever passed (JdbcAnalyzer.kt:47-50)
Catalog	defaultSchema	Assigned at JdbcAnalyzer.kt:48, never read
Schema	comment, compositeTypes	Schema(...) constructed once, JdbcAnalyzer.kt:39-44
CompositeType	whole class	Only referenced by Schema.compositeTypes
Identifier	catalog	Every constructor call passes name/schema only

Also populated but never read:

• norm.generator.CteDefinition.hasColumnList (SqlCteClause.kt:32, set at :132-134). Its own
  KDoc says no caller consults it.
• norm.generator.ParsedCteClause.isRecursive (SqlCteClause.kt:49, set at :79).
• The alias-name Set<String> half of parseOldNewAliasPrologue's return value
  (SqlOutputClause.kt:475-487). The only caller (:175) takes .second. parseOldNewAliasName
  (:501-513) exists solely to feed that discarded set.

Stale documentation:

• JdbcAnalyzer.kt:10-11 says the analyzer "Produces the same Wire protobuf types". The model is
  plain Kotlin data classes.
• CLAUDE.md lists a proto/ module and says the model types are "Wire proto types from
  proto/codegen.proto". git ls-files proto is empty.
• PgNodeExpression.kt:263 refers to CteDefinition "in SqlUtils.kt". The file is
  SqlCteClause.kt.

Target state

1. Delete every field in the table above and the CompositeType class. Update each type's
   @property KDoc to match.
2. Delete CteDefinition.hasColumnList and its assignment; parseSingleCteDefinition still has to
   skip the column list, it just stops recording that it did.
3. Delete ParsedCteClause.isRecursive. parseCteClause still skips the RECURSIVE keyword.
4. Change parseOldNewAliasPrologue to return Int (the item-list start index) and delete
   parseOldNewAliasName. Keep the KDoc sentence explaining what the prologue is and why it must be
   skipped.
5. Fix the three stale documentation references. In CLAUDE.md, remove the proto/ module from
   the tree, remove "Wire" from Key Technologies, and reword the pipeline step and Key Files entries
   that mention proto types to say "the model data classes in generator/.../Model.kt".

Test design

Deletion of unread code has no new behavior to pin. Proof is compilation plus the existing suite:

• generator/src/test/kotlin/norm/generator/SqlCteClauseTest.kt and SqlOutputClauseTest.kt must
  still pass unchanged; neither references the removed members (verified by grep). If either fails to
  compile, a reference was missed, not a test that needs rewriting.
• No test may be deleted or weakened by this change.

Acceptance criteria

1. None of the identifiers listed under "Current state" appear in generator/src/main,
   gradle-plugin/src/main, or any src/test tree (git grep returns nothing for each).
2. Column.embedTable, TypeRepository.getTypeProjectionForTable(table, columnOffset), and the
   embedTable != null branches are byte-identical to before.
3. ./gradlew :generator:check :gradle-plugin:test passes.
4. ./gradlew :gradle-plugin:generateGoldenFiles then git status --porcelain test-scenarios test-scenarios-frameworks prints nothing.
5. git grep -n "Wire\|codegen.proto\|SqlUtils" -- CLAUDE.md generator/src/main prints nothing.

Files

• generator/src/main/kotlin/norm/generator/Model.kt
• generator/src/main/kotlin/norm/generator/JdbcAnalyzer.kt (buildCatalog, class KDoc)
• generator/src/main/kotlin/norm/generator/SqlCteClause.kt
• generator/src/main/kotlin/norm/generator/SqlOutputClause.kt
• generator/src/main/kotlin/norm/generator/PgNodeExpression.kt (one KDoc line)
• CLAUDE.md

---

Conventions every issue inherits

• Repo root: /Volumes/Code/3rd-party/norm. Module under change is almost always generator/.
• Style: 2-space indent, 120 columns, full words in identifiers (parameter, not param), no
  section-separator comments, @Nested classes group tests. Format with ./gradlew spotlessApply.
• TDD: tests are written first or alongside. For a behavior-preserving refactor the existing suite is
  the pin; each issue says which tests must also be added.
• Golden files under test-scenarios*/ are never hand-edited. A refactor is behavior-preserving only
  if ./gradlew :gradle-plugin:generateGoldenFiles leaves git status --porcelain test-scenarios test-scenarios-frameworks empty.
• Verification for a generator/ change: ./gradlew :generator:check :gradle-plugin:test (Docker
  required). Then the golden regeneration check above.
• Commit message explains the design decision, not the diff.
• Never run ./gradlew clean or disable the configuration/build cache to "fix" a build problem.