fix(scheduler): casefold repository identity

[seonghobae]

Root cause

GitHub repository identity is case-insensitive, but scheduler owned-head and compare-ref routing used exact string equality. Canonical casing drift could therefore misclassify an organization-owned branch as an external fork and block normal restack/update processing.

This bounded successor carries the corresponding valid delta from historical Draft #1231 and is stacked after #2006.

RED → GREEN

• RED: 4fb514db54e6210fc0606f0dfa8d9033f3e1f6f5
  • requires Owner/Repo and owner/repo to use the same owned-head and compare-ref path
• GREEN: 75e9d67cba611fcdefb156e2bb8a3f3c0574c79b
  • case-folds identifiers at exactly the two routing boundaries
  • preserves external-fork and missing-metadata behavior
  • updates CHANGELOG, APA-style doctoring, and docs/product-technical-gap-baseline.md

Stack and authority

• Base: fix/scheduler-draft-merge-mutation-guard@5abc0a0284bcf2ee11715e642f882af73f1e8adb
• Normal fast-forward commits only; no force push or rebase
• No ownership, review, status, or mutation permission is broadened
• Status remains Proposed pending parent integration and fresh exact-head evidence

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