docs: create runbook for common operational scenarios

[FaveTeamz]

Summary

Operators need step-by-step runbooks for the situations most likely to occur in production.

Runbooks needed

1. Contract upgrade — build, optimize, upload WASM, call upgrade
2. Admin key rotation — two-step transfer procedure
3. Contributor cap emergency increase — requires governance vote + contract upgrade
4. Incident response — what to do if a bug is found post-deploy (pause strategy TBD)

Acceptance Criteria

• Each runbook is a standalone markdown file in docs/runbooks/
• Commands are annotated with expected output
• Cross-linked from README Operations section

[Mubking-dev]

@Mubking-dev has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi, I'm Mubaraq — a Full-Stack & Blockchain Developer with 3+ years of experience. I've reviewed this issue and I'm confident I can handle it. I'll submit a clean PR within 2–3 days. Please assign it to me!

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[nomsoscript]

@nomsoscript has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hey maintainer,
Please can I fix this. I know what to do and do it fast. I'd submit a merge-able PR.

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[Mrcee-arch]

@Mrcee-arch has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

please assign

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