Define and regenerate the standard codegen repository method set

Define and document the canonical "standard" method set the C++ codegen emits for every domain entity — the repository read/write/remove family and the table convert_to_table adapters — then audit the templates against that definition and regenerate all entities so the set is applied uniformly. Concretely: (1) write down the standard repository method set (e.g. read_latest variants, read_all(context) and read_all(context, key), read_at_timepoint(context, as_of) and the keyed variant, paginated read_latest(offset, limit), get_total_*_count, scalar and batch remove) and the standard table overloads (convert_to_table(const T&) and convert_to_table(const std::vector<T>&)); (2) reconcile cpp_domain_type_repository_{hpp,cpp}.org and cpp_domain_type_table_{hpp,cpp}.org against it; (3) regenerate every entity across all components; (4) tie this to the existing Codegen CI zero-diff invariant story so future drift is machine-caught rather than discovered at build time.

During the currency C++ core codegen sync, a full build surfaced that the codegen had silently dropped several previously-standard methods — read_all(context) (all versions across keys), read_at_timepoint(context, as_of) (all entities at a timepoint), and the single-object convert_to_table(const T&) overload. Hand-written consumers broke one at a time: ores.cli (application.cpp), the ores.refdata.api domain tests, and an ores.http route. Currency and currency_market_tier were fixed by promoting these back to standard template output, but every other entity (country, party, book_status, party_status, party_type, …) still lacks them until regenerated, leaving the codebase inconsistent. There is no agreed, written definition of the standard method set, so this kind of silent drop can recur. A single deliberate pass — define, reconcile, regenerate, guard — closes the gap.

• Surfaced during the currency codegen work: read_all(context), read_at_timepoint(context, as_of) and the single-object convert_to_table were inconsistently present across entities. The interim fix that promoted them lived on an earlier iteration of feature/sync-cpp-core-codegen-currency that was reset when main's own unified-model migration superseded it, so it is no longer a reachable commit; the underlying inconsistency this capture tracks stands.
• Repository/table generator templates (post-refactor org sources under projects/ores.codegen/library/templates/ores.cpp.*).

• Codegen CI zero-diff invariant — machine-enforce the regenerated-output invariant.
• Commission: currency — story where this surfaced (task 8A84D304).