feat: implement SDK/HTTP pruning for deduplication and tool-output truncation on SQLite

- executeDeduplication: now async, reads messages from SDK on SQLite via
  client.session.messages() instead of JSON file reads
- truncateToolOutputsByCallId: now async, uses truncateToolResultAsync()
  HTTP PATCH on SQLite instead of file-based truncateToolResult()
- deduplication-recovery: passes client through to both functions
- recovery-hook: passes ctx.client to attemptDeduplicationRecovery

Removes the last intentional feature gap on SQLite backend — dynamic
context pruning (dedup + tool-output truncation) now works on both
JSON and SQLite storage backends.

src/hooks/anthropic-context-window-limit-recovery/pruning-deduplication.ts

@@ -1,11 +1,14 @@
 import { readdirSync, readFileSync } from "node:fs"
 import { join } from "node:path"
+import type { PluginInput } from "@opencode-ai/plugin"
 import type { PruningState, ToolCallSignature } from "./pruning-types"
 import { estimateTokens } from "./pruning-types"
 import { log } from "../../shared/logger"
 import { getMessageDir } from "../../shared/opencode-message-dir"
 import { isSqliteBackend } from "../../shared/opencode-storage-detection"
 
+type OpencodeClient = PluginInput["client"]
+
 export interface DeduplicationConfig {
   enabled: boolean
   protectedTools?: string[]
@@ -45,7 +48,6 @@ function sortObject(obj: unknown): unknown {
 }
 
 function readMessages(sessionID: string): MessagePart[] {
-  if (isSqliteBackend()) return []
   const messageDir = getMessageDir(sessionID)
   if (!messageDir) return []
 
@@ -67,20 +69,29 @@ function readMessages(sessionID: string): MessagePart[] {
   return messages
 }
 
-export function executeDeduplication(
+async function readMessagesFromSDK(client: OpencodeClient, sessionID: string): Promise<MessagePart[]> {
+  try {
+    const response = await client.session.messages({ path: { id: sessionID } })
+    const rawMessages = (response.data ?? []) as Array<{ parts?: ToolPart[] }>
+    return rawMessages.filter((m) => m.parts) as MessagePart[]
+  } catch {
+    return []
+  }
+}
+
+export async function executeDeduplication(
   sessionID: string,
   state: PruningState,
   config: DeduplicationConfig,
-  protectedTools: Set<string>
-): number {
-  if (isSqliteBackend()) {
-    log("[pruning-deduplication] Skipping deduplication on SQLite backend")
-    return 0
-  }
-
+  protectedTools: Set<string>,
+  client?: OpencodeClient,
+): Promise<number> {
   if (!config.enabled) return 0
 
-  const messages = readMessages(sessionID)
+  const messages = (client && isSqliteBackend())
+    ? await readMessagesFromSDK(client, sessionID)
+    : readMessages(sessionID)
+
   const signatures = new Map<string, ToolCallSignature[]>()
   
   let currentTurn = 0