Use explicit ts specifiers for declarations

Restore explicit .ts relative specifiers in source and enable rewriteRelativeImportExtensions so emitted JS uses .js while declarations keep explicit .ts specifiers. Add a NodeNext declaration-consumer gate to prevent extensionless declaration regressions.

packages/core/agent-loop/src/agent.ts

@@ -11,8 +11,8 @@ import type { AgentId, AgentOptions, AgentStatus, SendOptions } from '@deepseek-
 import type { Agent } from '@deepseek-ai/dsh-agent'
 import type { ContentBlock, MessageSource } from '@deepseek-ai/dsh-llm'
 import type { Session } from '@deepseek-ai/dsh-session'
-import { Inbox } from './inbox'
-import { isTurnOpen, lastTurnNumber, runLoop } from './loop'
+import { Inbox } from './inbox.ts'
+import { isTurnOpen, lastTurnNumber, runLoop } from './loop.ts'
 
 /**
  * The concrete {@link Agent} implementation owned by the agent-loop plugin.

packages/core/agent-loop/src/index.ts

@@ -17,11 +17,11 @@ import type { Session } from '@deepseek-ai/dsh-session'
 import type {} from '@deepseek-ai/dsh-system-prompt'
 import type {} from '@deepseek-ai/dsh-tools'
 import type { SessionPersistence } from '@deepseek-ai/dsh-session-persistence'
-import { ReactLoopAgent } from './agent'
+import { ReactLoopAgent } from './agent.ts'
 
-export { ReactLoopAgent } from './agent'
-export { Inbox, type InboxMessage } from './inbox'
-export { runLoop } from './loop'
+export { ReactLoopAgent } from './agent.ts'
+export { Inbox, type InboxMessage } from './inbox.ts'
+export { runLoop } from './loop.ts'
 
 declare module 'cordis' {
   interface Context {

packages/core/agent-loop/src/loop.ts

@@ -13,7 +13,7 @@ import { BlockAssembler, HarnessError } from '@deepseek-ai/dsh-llm'
 import type { Session, TurnEndReason, TurnTrigger } from '@deepseek-ai/dsh-session'
 import { renderPrompt } from '@deepseek-ai/dsh-system-prompt'
 import type {} from '@deepseek-ai/dsh-tools'
-import type { ReactLoopAgent } from './agent'
+import type { ReactLoopAgent } from './agent.ts'
 
 /** An Error with an optional machine-readable code (e.g., from LlmError or a throwing plugin). */
 type CodedError = Error & { code?: string }

packages/core/agent/src/index.ts

@@ -7,9 +7,9 @@
 
 import { Context, Service } from 'cordis'
 import type { SessionId } from '@deepseek-ai/dsh-session'
-import type { Agent, AgentId, AgentOptions } from './types'
+import type { Agent, AgentId, AgentOptions } from './types.ts'
 
-export * from './types'
+export * from './types.ts'
 
 declare module 'cordis' {
   interface Context {

packages/core/session/src/index.ts

@@ -9,13 +9,13 @@
 import { Context, Service } from 'cordis'
 import { isAbsolute } from 'node:path'
 import type { ContentBlock, Message, MessageSource } from '@deepseek-ai/dsh-llm'
-import { SESSION_FORMAT_VERSION, SessionId } from './types'
-import type { CreateSessionOptions, SessionEvent, SessionEventMap, SessionEventType, SessionHeader } from './types'
-import { isJsonValue } from './json'
+import { SESSION_FORMAT_VERSION, SessionId } from './types.ts'
+import type { CreateSessionOptions, SessionEvent, SessionEventMap, SessionEventType, SessionHeader } from './types.ts'
+import { isJsonValue } from './json.ts'
 
-export * from './types'
-export { isJsonValue } from './json'
-export { interruptedTurnClosers } from './repair'
+export * from './types.ts'
+export { isJsonValue } from './json.ts'
+export { interruptedTurnClosers } from './repair.ts'
 
 declare module 'cordis' {
   interface Context {

packages/core/session/src/repair.ts

@@ -36,7 +36,7 @@
  */
 
 import type { CallId } from '@deepseek-ai/dsh-llm'
-import type { SessionEvent } from './types'
+import type { SessionEvent } from './types.ts'
 
 /**
  * Scan `events` for an open turn/step at the tail and return the synthetic

packages/core/tools/src/index.ts

@@ -24,7 +24,7 @@ export {
   type InferArgs,
   type DefineToolOptions,
   type JsonSchemaObject,
-} from './schema'
+} from './schema.ts'
 
 declare module 'cordis' {
   interface Context {

packages/core/tools/src/schema.ts

@@ -21,7 +21,7 @@
 
 import type { ContentBlock } from '@deepseek-ai/dsh-llm'
 import { assertNever, HarnessError } from '@deepseek-ai/dsh-llm'
-import type { ToolCallPresentation, ToolDefinition, ToolExecution, ToolResult, ToolResultPresentation } from './index'
+import type { ToolCallPresentation, ToolDefinition, ToolExecution, ToolResult, ToolResultPresentation } from './index.ts'
 
 // ---------------------------------------------------------------------------
 // SchemaSpec — the author-facing per-property type