docs: align Epic 10 final story state

[cbwinslow]

Final Story 10.2 documentation alignment only.

• marks Story 10.2 in the high-level epics file as implementation-complete / live-validation-pending
• marks Story 10.3 explicitly blocked by 10.2
• removes the stale completion-matrix claim that the TIGER loader cannot publish district geography
• records the merged 158-artifact Census manifest contract and validator
• keeps packed ACS district facts correctly marked as not yet published

No code, schema, source, or scope changes.

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Reviewing files that changed from the base of the PR and between b752cb3 and e63f157.

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• _bmad-output/planning-artifacts/epics.md
• _bmad-output/specs/spec-source-completion/completion-matrix.md

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