Complete contextual computed ordering release

[Dastari]

Summary

• bind entity-defined :named computed-order parameters from an entity-owned GraphQL server-context function
• keep GraphQL order inputs direction-only and reject raw backend placeholders
• append deterministic primary-key tie-breakers for entity and relation pagination
• add SQLite ASC/DESC and limit/offset coverage using COALESCE(exit_time, :as_of) - entry_time
• bump graphql-orm/macros to 0.29.0 and establish required storage/backup package tags at 0.6.2/0.7.2

Verification

• cargo test -p graphql-orm --features sqlite
• cargo test -p graphql-orm-macros
• PostgreSQL and MSSQL no-default-feature compile lanes
• warnings-denied Clippy and Rustdoc for runtime and macros
• documentation, inventory, dependency, package-release, SemVer, and deterministic release-manifest checks
• release manifest --verify-tags passes

Documentation impact

• Documentation updated
• No documentation impact

Explanation: Updated changelog, migration guidance, package READMEs, macro/attribute reference, generated workspace inventory, and storage/backup release notes.