Gate JSDoc completeness on every package export

New doc-sync gate verify-export-jsdoc walks every module-level exported
name under packages/*/*/src and requires description prose everywhere,
plus @param per parameter and @returns on non-void annotated returns for
function-like exports, public class methods, properties, and accessors.
The parsing + check helpers move out of gen-cordis-catalog.ts into a
shared scripts/jsdoc.ts so 'documented' means one thing on both gated
surfaces.

Deliberate exemptions (documented in the RFC): heritage-declared class
members (the seam declaration is the doc's one home — the one checker
query in an otherwise pure-AST walk), cordis plugin-protocol slots
(name/inject/reusable/Config/apply, top-level and static), constructors,
overload implementations, declare-module augmentation bodies, and
re-export statements (checked at the defining module).

The 203 under-documented exports the gate found at adoption are filled
in this change, so the gate lands green; generated catalogs/graphs are
regenerated for the shifted line pointers.

RFC: docs/rfc/implemented/process/2026-07-06-export-surface-jsdoc-gate.md

packages/llm/llm-deepseek/src/index.ts

@@ -34,6 +34,12 @@ export type * from './types.ts'
 export const name = 'llm-deepseek'
 export const inject = ['llm']
 
+/**
+ * Plugin config, validated by the same-named schemastery schema. Every field
+ * is optional in yml: credentials/endpoint fall back to the environment (a
+ * missing API key fails plugin load, not the first call), and omitted
+ * thinking fields send nothing on the wire, so the provider default applies.
+ */
 export interface Config {
   /** API key; falls back to $DEEPSEEK_API_KEY. Required one way or the other. */
   apiKey?: string