fix(nim-bindings): add all-endpoints test and fix installation_name ABI

[osmaczko]

Add nim-bindings/tests/test_all_endpoints.nim which imports bindings directly and calls every FFI proc, forcing the linker to include all symbols. This catches link-time and runtime issues that the pingpong example missed because unused symbols were optimised out.

Running the new test revealed an ABI mismatch in installation_name: the Rust function used an explicit out-parameter but ReprCString has only flat fields, so Nim emits it as a C return value.

CI now runs nimble test next to nimble pingpong.

[Copilot]

Pull request overview

This PR strengthens the Nim FFI coverage by adding an “all endpoints” test that forces the linker to pull in every exported symbol, and fixes an ABI mismatch for installation_name by changing it to return repr_c::String by value.

Changes:

• Add test_all_endpoints.nim to call every Nim importc proc at least once (linker/symbol coverage + basic runtime sanity).
• Fix installation_name ABI by switching from an explicit out-parameter to a return value on the Rust side.
• Update Nimble/CI to run the new comprehensive test via nimble test.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
nim-bindings/tests/test_all_endpoints.nim	New comprehensive endpoint/linker coverage test for Nim bindings.
nim-bindings/src/bindings.nim	Updates doc comment around installation_name (ownership/freeing note removed).
nim-bindings/conversations_example.nimble	Adds task test to compile/run the new all-endpoints test.
conversations/src/api.rs	Changes installation_name to return repr_c::String directly (ABI fix).
.github/workflows/ci.yml	Runs nimble test instead of nimble pingpong.

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[Copilot]

Pull request overview

Copilot reviewed 8 out of 8 changed files in this pull request and generated 5 comments.

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