feat!: remove the deep-research feature

The harness ships browser tools; orchestrating a multi-agent research
workflow on top of them is the agent's job, not this extension's. Drops
the skill, the /deep-research command, and the web-search-researcher
subagent config.

browser_web_search and browser_read_page are untouched — the two tests
that covered their pure parsers move to test/domains/, where the test
glob still picks them up.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

2 files changed, 0 insertions, 27 deletions

diff --git a/src/deep-research.ts b/src/deep-research.ts
deleted file mode 100644
index 9445cf8..0000000
--- a/src/deep-research.ts
+++ /dev/null
@@ -1,25 +0,0 @@
-import type { ExtensionAPI } from "@mariozechner/pi-coding-agent";
-
-export function buildDeepResearchPrompt(question: string): string {
-  return (
-    `Do deep research on the following question and produce a cited Markdown report. ` +
-    `Use the deep-research skill: decompose it into sub-questions, fan out web-search-researcher ` +
-    `subagents to research each against the live web, then synthesize a source-cited report file.\n\n` +
-    `Question: ${question}`
-  );
-}
-
-export function registerDeepResearchCommand(pi: ExtensionAPI): void {
-  pi.registerCommand("deep-research", {
-    description: "Research a question on the web and write a cited report",
-    handler: async (args, ctx) => {
-      const question = args.trim();
-      if (question.length === 0) {
-        ctx.ui.notify('Usage: /deep-research <question>. Example: /deep-research "compare CDP vs WebDriver"', "warning");
-        return;
-      }
-      ctx.ui.notify(`Starting deep research: ${question}`, "info");
-      pi.sendUserMessage(buildDeepResearchPrompt(question));
-    },
-  });
-}
diff --git a/src/index.ts b/src/index.ts
index e0fa750..1573605 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -4,7 +4,6 @@ import { getBrowserSystemPrompt } from "./prompt";
 import { registerSetupCommand } from "./setup";
 import { registerProfileCommand } from "./profile/command";
 import { readPin } from "./profile/store";
-import { registerDeepResearchCommand } from "./deep-research";
 import { type BrowserState, defaultState, persistState, restoreState } from "./state";
 import { registerAllTools } from "./registry";
 import { cleanupTempDirs } from "./util/truncate";
@@ -124,7 +123,6 @@ export default function browserHarnessExtension(pi: ExtensionAPI): void {
     }
     registerSetupCommand(pi, client);
     registerProfileCommand(pi, client);
-    registerDeepResearchCommand(pi);
   });
 
   pi.on("session_shutdown", async () => {