linear phase 5: webhook integration

[brkastner]

summary

• adds webhook verification config (task-1) and payload normalization (task-2)
• persists linear webhook deliveries (task-3) and adds the ingestor (task-4)
• exposes the webhook endpoint (task-5) with observability (task-6)
• documents and verifies the end-to-end workflow (task-7)
• post-review fixes: 503 response on missing secret, trigger-row id return from enqueue, doc alignment

test plan

• go test ./...
• manual webhook delivery against local endpoint
• confirm metrics/logs surface for ingested deliveries

[github-actions]

docs drift detected

The following code changes don't have matching doc updates:

{
  "drift": [
    {
      "code_changed": "cmd/serve.go",
      "docs_not_changed": [
        "web/docs/docs/cli-reference/serve.mdx"
      ]
    }
  ]
}

bypass: see scripts/git-hooks/README.md

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