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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* docs: remove stale Windsurf support references

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* docs: fix Kilo Code command path in upgrade guide

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* chore: align integration lists after rebase

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* docs: align kilocode example with runtime behavior

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integrations/catalog.json

@@ -48,15 +48,6 @@
       "repository": "https://github.com/github/spec-kit",
       "tags": ["ide"]
     },
-    "windsurf": {
-      "id": "windsurf",
-      "name": "Windsurf",
-      "version": "1.0.0",
-      "description": "Windsurf IDE workflow integration",
-      "author": "spec-kit-core",
-      "repository": "https://github.com/github/spec-kit",
-      "tags": ["ide"]
-    },
     "amp": {
       "id": "amp",
       "name": "Amp",