refactor(ffi): rename Hexadeca-Connector to UnifiedApiAdapter everywhere

[hyperpolymath]

Estate-wide rename, canonical repo first: the unified Zig API pattern Hexadeca-Connector → UnifiedApiAdapter (unified-api-adapter in paths/files).

What changed

• ffi/zig/src/hexadeca.zig → unified-api-adapter.zig; struct HexadecaSuite → UnifiedApiAdapter
• test/hexadeca_contract_test.exs → test/unified-api-adapter-contract_test.exs (module Hypatia.UnifiedApiAdapterContractTest; _test.exs suffix preserved so mix's default *_test.exs glob still discovers it)
• All prose/doc/machine-readable references updated (27 files, 61±61 lines)
• Draft audit-workflow doc now references the new shared-action path zig-unified-api-adapter-check (lands via the cicd-suite expand→migrate→contract migration running alongside this PR)

What did NOT change (contract safety)

• The 16 connector names and wire ids are byte-identical (verified by diff against the pre-rename golden list)
• All 18 hypatia_* C exports untouched
• portFor = base + id + 1 arithmetic untouched

Verification

• Zero residual hexadeca hits in-tree
• Drift-guard mirrors simulated: Zig unified-api-adapter.zig, Idris2 src/abi/Types.idr, Rust clients/rust/hypatia-client/src/connector.rs all still extract the golden 16 in order, ids 0–15
• connectors.json _note paths updated to the new filenames

Companion PRs: cicd-suite (action expand), idaptik, boj-server, standards, proven-servers + ~26 consumer repos flipping the shared-action path.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between a79a354 and 7217906.

📒 Files selected for processing (27)

• AFFIRMATION.adoc
• clients/rust/hypatia-client/Cargo.toml
• clients/rust/hypatia-client/src/connector.rs
• clients/rust/hypatia-client/src/lib.rs
• docs/DEBT-REGISTER.adoc
• docs/design/estate-audit-workflow-draft.adoc
• docs/governance/CRG-AUDIT-2026-04-18.adoc
• docs/status/estate-musts-intends-wishes-2026-06-19.adoc
• ffi/connectors.json
• ffi/zig/README.adoc
• ffi/zig/src/connectors/bebop.zig
• ffi/zig/src/connectors/bsp.zig
• ffi/zig/src/connectors/capnproto.zig
• ffi/zig/src/connectors/flatbuffers.zig
• ffi/zig/src/connectors/graphql.zig
• ffi/zig/src/connectors/grpc.zig
• ffi/zig/src/connectors/jsonrpc.zig
• ffi/zig/src/connectors/mqtt.zig
• ffi/zig/src/connectors/rest.zig
• ffi/zig/src/connectors/soap.zig
• ffi/zig/src/connectors/trpc.zig
• ffi/zig/src/connectors/verisimdb_rest.zig
• ffi/zig/src/connectors/websocket.zig
• ffi/zig/src/unified-api-adapter.zig
• src/Hypatia/ABI/Types.idr
• src/abi/Types.idr
• test/unified-api-adapter-contract_test.exs

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