Retire the SPIKES status badge now the deployable Worker has landed

[ParallelEntrepreneur]

The deployable Worker itself landed in #46 (plus #47 migrations fix): crates/auth-worker composes auth-core + oidc + passkeys + magic-link + password + meta over factory0-runtime-cloudflare with #[event(fetch)]/#[event(scheduled)], wrangler.toml staging + auth.factory0.ventures production, deploy.yml (main to staging, v* tag to prod behind approval), smoke.sh (/__health + discovery + JWKS), and 6 collected migrations. The branch was clean vs main with zero diff, so there was no worker code left to write.

What remained repo-actionable from #41's acceptance list was the last box: "The README's status badge stops saying SPIKES". This change does only that:

• README.md badge STATUS-SPIKES to STATUS-BETA (deliberately not claiming production is live).
• Status section rewritten (3 lines): worker composes all merged modules and deploys via wrangler staging/prod; first deploy blocked on owner steps (D1 IDs, secrets, domain, first v* tag); SAML SSO still deferred.

Explicitly out of scope (needs-human, cannot be done from a colony): wrangler d1 create IDs (wrangler.toml:23,33 still placeholders), HARNESS_SECRET/RESEND_API_KEY and CLOUDFLARE_* repo secrets, the auth.factory0.ventures custom domain, the first v* tag and live staging/prod smoke, and a first registered client completing code+PKCE (registration exists as POST /admin/clients in auth-core/src/clients.rs with no seed row; no bootstrap runbook exists yet).

How verified:

• Subagent-confirmed repo state: worker, wrangler.toml, deploy.yml, smoke.sh, migrations/ all present; git log shows 51e1dd6 (feat(auth-worker): the deployable auth Worker (#41) #46) and d572e8e (feat(auth-fz): venture fz CLI + collected migrations; fix magic-link template id (#41) #47) on main.
• smoke.sh is executable and passes bash -n; shellcheck/cargo unavailable in this sandbox (no Rust toolchain, image is node:24-bookworm), so no test run was possible — CI on feat(auth-worker): the deployable auth Worker (#41) #46 was green incl. wasm build + conformance per the issue comment.
• Final git diff --stat: README.md only, 4 insertions / 4 deletions; git status shows M README.md with no untracked files.

Reviewers: check badge wording choice (BETA vs another neutral label) — no source in repo dictated the replacement text.

Closes #41

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