flyemoji ac02c69612 docs(troubleshooting): add operator failure-mode checklist
Add docs/troubleshooting.md covering the common failure modes the spec
implies, grounded in the actual control-plane code paths:

- Stuck Starting (PodNotReady / RconSecretUnavailable / RconNotReachable)
  and the deliberate absence of a Starting->Failed timeout.
- Failed reachable only via InvalidSpec on a malformed spec.storage.size,
  plus the stale status.endpoint=direct caveat after a failure.
- Routing via status.endpoint direct/fallback and the empty fallbackServer
  pitfall; wake 403/429/503 gate order.
- online-mode coupling and Velocity's offline-mode routing refusal.
- Cloudflare Access 401/403, nil-Keyfunc fail-closed, audience checks,
  the absence of an issuer check, and local-session gating.
- Internal service-token (FELIS_SERVICE_TOKEN) rejection path.
- link/claim error codes, Kaniko build denials (SA-by-absence RBAC,
  default-deny egress, internal-registry push gate), and the registry
  DNS contract.
- Reaper backup-before-delete invariant and false-delete vectors.
- Unimplemented idle auto-stop, permanently-zero players.online, the
  inert CRD fields, and the always-survives world PVC behaviour.

Each item is labelled with its evidence grade (GO-TESTED / CODE-ONLY /
INTEGRATION-ONLY / INERT) so operators know what is verified versus
asserted.
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