fix(sat): unify Campaign/CampaignSummary status into a shared enum schema

[dmchaledev]

Summary

• sat/openapi.yaml's CampaignSummary.status field is a validated enum (Created, Queued, In progress, Emails Sent, Completed, Draft, In Review, Approved), but the identical conceptual field on Campaign (the schema returned by getCampaign/listCampaigns) was a plain, untyped string — no enum at all.
• The approval-workflow endpoints (submit-review, approve, reject) confirm Draft/In Review/Approved are real states shared across both representations, so this was a real modeling gap, not an intentional difference: a client hitting the full-detail getCampaign endpoint got no schema-level validation or generated typing for status, while the same value via the summary endpoint did.
• Since the README frames these specs as a source for generated SDKs/MCP tool definitions, this asymmetry meant generated typings for "campaign status" would differ depending on which endpoint the value came from.

Fix: factored the enum into a new shared CampaignStatus component schema and pointed both Campaign.status and CampaignSummary.status at it via $ref.

Pre-flight duplicate check

• I searched open issues (sat/openapi.yaml: SSO tag advertises OIDC support, but no OIDC endpoints are documented anywhere #61, sat/openapi.yaml: no 429/rate-limit documentation anywhere (inconsistent with asm/openapi.yaml) #58, Pin third-party GitHub Actions to full-length commit SHAs (supply-chain hardening) #57, sat/openapi.yaml: several write endpoints are missing a requestBody schema #39) and open PRs for changes to the same file/field and did not find an existing one covering this change.

Related issues/PRs

None — no existing open issue or PR touches Campaign/CampaignSummary status modeling.

Testing

• spectral lint sat/openapi.yaml --ruleset .spectral.yaml --fail-severity error → 0 errors (same 8 pre-accepted trailing-slash warnings as before).
• python3 -c "import yaml; yaml.safe_load(open('sat/openapi.yaml'))" → parses cleanly.

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