[codex] Connect webhook deployment to coven-github

[BunsDev]

Summary

• Add an example installation/repository policy for routing a GitHub App install to a familiar.
• Document how the TypeScript webhook deployment connects to the canonical OpenCoven/coven-github app manifest and operating model.
• Add a regression test proving the example policy routes a labeled issue into a queued familiar task.

Verification

• npm test — 12/12
• npm run build
• git diff --check

[Copilot]

Pull request overview

This PR connects this webhook deployment bundle more explicitly to the canonical OpenCoven/coven-github operating model by adding an operator-facing connection guide, a concrete example routing policy, and a regression test that exercises policy-based routing for labeled issues.

Changes:

• Add a checked-in example installation/repository policy (config/example-policy.json) for routing a GitHub App installation+repo to a specific familiar.
• Add operator documentation describing how to register the GitHub App (via coven-github) and configure this deployment to use it.
• Add a regression test that loads the example policy and verifies a labeled issue is routed into a queued familiar task; update README to reference the new artifacts.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
tests/webhook-adapter.test.ts	Adds regression coverage that the example policy routes a labeled issue into a queued task with the configured familiar.
README.md	Documents the new example policy and the new coven-github connection guide.
docs/coven-github-connection.md	Adds an operator guide for wiring this deployment to the canonical OpenCoven/coven-github app manifest and runtime inputs.
config/example-policy.json	Introduces a concrete example policy that demonstrates installation+repo routing to a familiar.

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