Fix README commands that match no hanzo subcommand #11

Summary

Four commands in the README match no hanzo subcommand, and the README says an unknown first word is read as a coding task. Typing hanzo clusters list as written starts an AI session about "clusters list". One docs link also returns 404.

Evidence

Checked at 5ce6db4.

• README.md:140 hanzo agents run <agent>, :141 hanzo clusters create|list|pools|rm, :142 hanzo cloud list|accounts, :121 hanzo connector add|list|verify|rm --provider cloudflare.
• In src/commands/product/generated.rs the agent ops are product: "agent" (singular, lines 51-60), the cluster ops are product: "compute", nodes: ["clusters"] (lines 841-846), there is no cloud product (grep -c 'product: "cloud"' src/commands/product/generated.rs prints 0), and the connection ops are product: "connection", not connector. The Commands enum in src/main.rs has no Agents, Clusters, Cloud or Connector variant.
• With the released 8.5.753 binary, hanzo agents --help prints the root page (Usage: hanzo [OPTIONS] [TASK]), while hanzo agent --help prints "Autonomous agents for your org". Same for clusters, cloud, connector.
• README.md:155 links https://docs.hanzo.ai/docs/services/graph, which returns 404. https://docs.hanzo.ai/docs/openapi/graph returns 200.

What to do

For each of the four lines, find the real command (hanzo --help, hanzo compute --help, hanzo connection --help, or the Op rows in generated.rs) and rewrite the line, or delete it if the command does not exist. Point the graph link at the working page. Do not add commands to the CLI.

Acceptance criteria

• For every command in the two fenced blocks under "Identity & billing" and "Cloud", hanzo <words> --help prints that command's own help, not the root usage page (build from this commit or use the latest release).
• No line is left that starts a coding session when typed as written.
• The graph link returns 200.
• cargo test is unaffected (docs-only change).

Difficulty: starter

Points: 75 (Hanzo Rewards, reputation points; not money; see https://hanzo.ai/bounty)

Maintainer: zeekay

How to claim

1. Comment on this issue so others know you are on it.
2. Open a pull request that says Fixes #11.
3. Link your GitHub account to your Hanzo account at hanzo.ai/leaderboard so the merge counts.