Resolves the final table archive configuration by merging the resource-level archive map (built from the DSL) with the domain-level archive defaults.

Priority rules

• Resource has no AshArchival.Resource extension → archive is nil, regardless of what the domain provides. Archive cannot be applied to a resource that does not have AshArchival in its extensions.
• Resource has AshArchival.Resource and an explicit archive block:
  • enabled: false on the resource block disables archive entirely (used during testing — overrides the domain).
  • Otherwise the resource block wins per key; missing keys fall back to the domain; missing in both → built-in default for that key.
• Resource has AshArchival.Resource but no archive block:
  • If the domain defines archive defaults, use them (inherit fully).
  • If neither side defines anything, fall back to the built-in defaults (the canonical {:master_*, :*} action set). This preserves existing behaviour for resources that just opt in via AshArchival.

Action value semantics

• Atom value (e.g. :archived) — used for both master and tenant requests.
• Tuple value {master, tenant} — master for users without site_id, tenant for users scoped to a site_id. Enforcement lives inside the Ash actions themselves; this module only routes which atom to call.

See MishkaGervaz.Table.Transformers.BuildRuntimeConfig (the caller), MishkaGervaz.Table.Dsl.Defaults (where domain-level archive is set), and MishkaGervaz.Resource.Info.Table (downstream reader).