TML-2787: M:N slice 3 — nested writes through the junction#683

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tensordreams wants to merge 9 commits into

tml-2786-slice-2-filterfrom

tml-2787-slice-3-write

Commits on Jun 5, 2026

docs(sql-orm-many-to-many): slice 3 spec + plan (TML-2787)
tensordreams
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feat(sql-orm-client): route M:N nested writes through the junction table
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feat(sql-orm-client): guard junction create when required payload columns exist
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feat(sql-orm-client): disable connect on required-payload junctions; finish write integration tests
tensordreams
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docs(sql-orm-many-to-many): slice 3 specs/briefs/trace/learnings (TML-2787)
tensordreams
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fix(sql-orm-client): brand Tag/Role id constants as Char<36> in mn-nested-write test; re-emit fixtures with through blocks
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feat(sql-orm-client): disable nested create on required-payload M:N relations at the type level
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feat(sql-orm-client): extend junction link-write gate to cover connect
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test(sql-orm-client): bypass type gate in required-payload runtime-guard tests
tensordreams
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