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>

5 files changed, 0 insertions, 75 deletions

diff --git a/test/deep-research/fixtures/article-capture.json b/test/deep-research/fixtures/article-capture.json
deleted file mode 100644
index df9c67c..0000000
--- a/test/deep-research/fixtures/article-capture.json
+++ /dev/null
@@ -1,17 +0,0 @@
-{
-  "url": "https://blog.example.com/how-cdp-works",
-  "title": "How the Chrome DevTools Protocol Works",
-  "blocks": [
-    { "kind": "other", "text": "Home Products Blog About Contact", "linkTextLength": 33, "inBoilerplate": true },
-    { "kind": "heading", "text": "How the Chrome DevTools Protocol Works", "linkTextLength": 0, "inBoilerplate": false },
-    { "kind": "paragraph", "text": "The Chrome DevTools Protocol lets tools instrument, inspect, and control Chromium-based browsers over a WebSocket connection.", "linkTextLength": 0, "inBoilerplate": false },
-    { "kind": "paragraph", "text": "Each command targets a domain such as Page, Runtime, or Network, and receives a structured JSON response that the client correlates by id.", "linkTextLength": 0, "inBoilerplate": false },
-    { "kind": "heading", "text": "Sessions and Targets", "linkTextLength": 0, "inBoilerplate": false },
-    { "kind": "paragraph", "text": "A target is a page or worker; attaching to one yields a session id that scopes subsequent commands to that target without disturbing others.", "linkTextLength": 0, "inBoilerplate": false },
-    { "kind": "listitem", "text": "Attach with Target.attachToTarget", "linkTextLength": 0, "inBoilerplate": false },
-    { "kind": "listitem", "text": "Drive with Runtime.evaluate", "linkTextLength": 0, "inBoilerplate": false },
-    { "kind": "paragraph", "text": "Subscribe here for our newsletter and follow us on social media for updates", "linkTextLength": 55, "inBoilerplate": true },
-    { "kind": "other", "text": "Copyright 2026 Example Inc. Privacy Terms Cookies", "linkTextLength": 24, "inBoilerplate": true }
-  ],
-  "bodyText": "Home Products Blog How the Chrome DevTools Protocol Works The Chrome DevTools Protocol lets tools instrument inspect and control browsers Copyright 2026"
-}
diff --git a/test/deep-research/fixtures/google-serp-captcha.json b/test/deep-research/fixtures/google-serp-captcha.json
deleted file mode 100644
index 7c6610f..0000000
--- a/test/deep-research/fixtures/google-serp-captcha.json
+++ /dev/null
@@ -1,4 +0,0 @@
-{
-  "anchors": [],
-  "pageText": "About this page Our systems have detected unusual traffic from your computer network. This page checks to see if it's really you sending the requests and not a robot. Why did this happen? To continue, please type the characters below. reCAPTCHA."
-}
diff --git a/test/deep-research/fixtures/google-serp-empty.json b/test/deep-research/fixtures/google-serp-empty.json
deleted file mode 100644
index 34bb1dc..0000000
--- a/test/deep-research/fixtures/google-serp-empty.json
+++ /dev/null
@@ -1,4 +0,0 @@
-{
-  "anchors": [],
-  "pageText": "Your search - asdkfjhqwlekjrhqwlekjrhqwe - did not match any documents. Suggestions: Make sure that all words are spelled correctly. Try different keywords."
-}
diff --git a/test/deep-research/fixtures/google-serp-ok.json b/test/deep-research/fixtures/google-serp-ok.json
deleted file mode 100644
index 61aa483..0000000
--- a/test/deep-research/fixtures/google-serp-ok.json
+++ /dev/null
@@ -1,40 +0,0 @@
-{
-  "anchors": [
-    {
-      "href": "https://www.google.com/url?q=https://real.example/x&sa=U&ved=abc",
-      "heading": "Real Example X — the definitive guide",
-      "snippet": "Real Example X — the definitive guide. Everything about x, explained clearly."
-    },
-    {
-      "href": "https://docs.example.org/guide",
-      "heading": "Official Guide",
-      "snippet": "Official Guide to the thing you searched for."
-    },
-    {
-      "href": "https://www.google.com/search?q=related",
-      "heading": "Related searches on Google",
-      "snippet": "internal google navigation"
-    },
-    {
-      "href": "javascript:void(0)",
-      "heading": "Expand",
-      "snippet": "ui control"
-    },
-    {
-      "href": "https://real.example/x/",
-      "heading": "Real Example X (duplicate with trailing slash)",
-      "snippet": "should be deduped against the first result"
-    },
-    {
-      "href": "https://second.example/a",
-      "heading": "Second Example A",
-      "snippet": "Second result body."
-    },
-    {
-      "href": "https://third.example/b",
-      "heading": "Third Example B",
-      "snippet": "Third result body."
-    }
-  ],
-  "pageText": "Real Example X the definitive guide Official Guide Second Example Third Example About 12,300 results"
-}
diff --git a/test/deep-research/fixtures/no-article-capture.json b/test/deep-research/fixtures/no-article-capture.json
deleted file mode 100644
index d367b7e..0000000
--- a/test/deep-research/fixtures/no-article-capture.json
+++ /dev/null
@@ -1,10 +0,0 @@
-{
-  "url": "https://app.example.com/dashboard",
-  "title": "Dashboard",
-  "blocks": [
-    { "kind": "other", "text": "Menu", "linkTextLength": 4, "inBoilerplate": true },
-    { "kind": "listitem", "text": "Widget A", "linkTextLength": 8, "inBoilerplate": true },
-    { "kind": "listitem", "text": "Widget B", "linkTextLength": 8, "inBoilerplate": true }
-  ],
-  "bodyText": "Dashboard Widget A Widget B Your account is active. Usage this month is within limits and no action is required at this time from you."
-}