chore: retire Windsurf integration — absorbed into Cognition Devin (#3168) (#3213)

* chore: retire windsurf integration — absorbed into Cognition Devin (#3168)

windsurf.com now permanently redirects to devin.ai/desktop following
acquisition. Remove subpackage, registry/catalog entries, docs, and tests;
re-point sample-agent test fixtures to Kilo Code.

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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* docs: remove stale Windsurf support references

Assisted-by: GitHub Copilot (model: gpt-5.3-codex, autonomous)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* docs: fix Kilo Code command path in upgrade guide

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Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

* chore: align integration lists after rebase

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Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

* docs: align kilocode example with runtime behavior

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---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

tests/test_workflows.py

@@ -650,8 +650,8 @@ class TestBuildExecArgs:
         assert "--yolo" in args
 
     def test_ide_only_returns_none(self):
-        from specify_cli.integrations.windsurf import WindsurfIntegration
-        impl = WindsurfIntegration()
+        from specify_cli.integrations.kilocode import KilocodeIntegration
+        impl = KilocodeIntegration()
         assert impl.build_exec_args("test") is None
 
     def test_no_model_omits_flag(self):