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/subagent/subagent-inprocess/src/index.ts

@@ -34,7 +34,11 @@ declare module '@deepseek-ai/dsh-agent' {
   }
 }
 
-/** Read an agent's delegation depth (absent ⇒ a top-level agent, depth 0). */
+/**
+ * Read an agent's delegation depth (absent ⇒ a top-level agent, depth 0).
+ * @param agent - the agent whose options may carry `subagentDepth`.
+ * @returns 0 for a top-level agent, its parent's depth + 1 for a subagent.
+ */
 export function depthOf(agent: Agent): number {
   return agent.options.subagentDepth ?? 0
 }
@@ -88,6 +92,13 @@ export interface InProcessRunOptions {
  * the matching `turn/end.reason` the stop reason. `dispose()` delegates to the
  * factory's {@link AgentHandle.dispose} (stop loop → await quiescence → remove
  * session); `cancel()` cancels the child's in-flight turn.
+ *
+ * Throws {@link SubagentDepthError} before creating anything when the child's
+ * depth (parent depth + 1) would exceed `request.maxDepth`.
+ * @param ctx - the context whose `agents` factory creates and owns the child.
+ * @param request - the start request (prompt, parent, signal, per-child options).
+ * @param options - the backend's inputs: provider name plus the optional seed.
+ * @returns the live run handle for the child agent.
  */
 export function startInProcessRun(
   ctx: Context,