Bring the contributor docs up to date with the repo

The v0.2.0 site review found contributor docs describing an earlier repo. Each item below was checked against the file it names:

• docs/development/README.md says "Informs Q7" and calls the design doc pending ("once adopted"). Q7 shipped in #20 and the design doc was adopted in #14.
• docs/development/kubernetes-conventions.md calls itself the spec "until they land". Those patterns landed in internal/controller/metrics.go and observability.go.
• docs/development/documentation-standards.md says the project is in early development and names a docs/operations/ directory that never existed. technical-debt.md uses the same path in an example.
• CONTRIBUTING.md lists six of make check's targets and says it mirrors CI, which it does not. It also says make manifests generate where verify-helm-sync needs helm-sync too, and never mentions make vendor.
• docs/development/releasing.md does not mention the meta description a news post needs in website/.vitepress/config.mjs.
• docs/development/kind-iteration.md never says how the Deployment gets the new image.
• CLAUDE.md names four CI workflows; eight run.

One docs PR can clear all of them.