feat: add cloud-provider-regression skill and increase benchmark timeout

- Increase local /metrics scrape timeout to 5 minutes to accommodate server-side metric compilation for very large scale zero-copy graphs.
- Add new cloud-provider-regression analysis skill.

Author: solderzzc

skills/analysis/cloud-provider-regression/SKILL.md

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+---
+name: Cloud Provider Regression Test
+description: Connectivity, chat, JSON & streaming regression tests for all enabled cloud LLM providers
+version: 1.0.0
+category: analysis
+runtime: node
+entry: scripts/run-regression.cjs
+install: npm
+requirements:
+  node: ">=18"
+  npm_install: false
+  platforms: ["linux", "macos", "windows"]
+---
+
+# Cloud Provider Regression Test
+
+Tests every enabled cloud provider for connectivity, chat completion, JSON output, and SSE streaming.
+Reads keys from `~/.aegis-ai/llm-config.json`.
+
+## Standalone
+
+```bash
+node scripts/run-regression.cjs                    # all providers
+node scripts/run-regression.cjs --provider glm,xai # specific
+node scripts/run-regression.cjs --verbose           # full responses
+```
+
+## Protocol
+
+```jsonl
+{"event":"ready","providers":8}
+{"event":"test_result","suite":"GLM","test":"chat","status":"pass","timeMs":1930}
+{"event":"complete","passed":14,"failed":1,"total":15,"timeMs":38000}
+```
+
+## Tests Per Provider
+
+| Test | Verifies |
+|------|----------|
+| Chat | Connectivity, auth, URL construction, param compat |
+| JSON | Structured output (JSON instruction following) |
+| Stream | SSE streaming, chunks received |
+
+Results saved to `~/.aegis-ai/regression-tests/`.

skills/analysis/cloud-provider-regression/config.yaml

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+params:
+  - key: providers
+    label: Provider Filter
+    type: string
+    default: "all"
+    description: "Comma-separated provider IDs to test, or 'all'"
+
+  - key: skipJson
+    label: Skip JSON test
+    type: boolean
+    default: false
+    description: Skip the JSON output test
+
+  - key: skipStream
+    label: Skip streaming test
+    type: boolean
+    default: false
+    description: Skip the SSE streaming test
+
+  - key: timeout
+    label: Request Timeout (ms)
+    type: number
+    default: 30000
+    description: Per-request timeout in milliseconds