Ingestion-time per-module declaration index: land import-member claim integrity, the cited-symbol wall, and module authorship facts on ONE construction, as DESIGN's two next-rung triggers require, instead of three corpus walks

[gunbai-bot]

Auto-opened by session-dashboard for session royal-dove-799.
Pushing to adopt/decl-index advances this PR.

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[gunbai-bot]

Duplicate. This branch was an adoption copy of the orphaned #9211; the dashboard auto-opened a PR on it. Continuing on #9211 itself so the construction has one PR and one review surface.