chore: pin logos-protocol 0f26ffd, and move CI to Nix 2.35.1 (#133)

Bumps this repo's own `logos-protocol` root pin from 3a31c91d (Jul 31) to
0f26ffd (Aug 6, current master). Span is two protocol PRs, #40 and #41.

Why per-repo pins rather than `follows` overrides: on macOS, two different
protocol revisions statically linked into one process get their weak
definitions coalesced by dyld, so one image's protocol code silently binds
to the other's. That is not a build error — it is a runtime miscompile, and
it bites across real ABI changes (`awaitCompletion` gained parameters;
`RpcValue`'s variant gained `uint64_t` in the middle, renumbering later
alternatives). The durable fix is for every repo in the chain to pin the
same protocol, so no override is needed anywhere.

CI: cachix/install-nix-action v27 -> v31, i.e. Nix 2.22.1 -> 2.35.1. 2.22.1
is old enough to mis-evaluate flake input overrides newer Nix handles fine.
Nothing in this commit needs 2.35.1 — verified to evaluate on 2.22.1 too —
but the rest of the chain does, and logos-standalone-app already runs v31
for exactly this reason.

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -14,7 +14,12 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: cachix/install-nix-action@v27
+      # v27 pins Nix 2.22.1, which is old enough to mis-evaluate flake input
+      # overrides that newer Nix handles fine (notably nested
+      # `a.inputs.b.inputs.c.follows`, which 2.22 rejects with "cannot find
+      # flake in the flake registries"). v31 pins 2.35.1. Keep this in step
+      # with logos-standalone-app, which already runs v31 for the same reason.
+      - uses: cachix/install-nix-action@v31
         with:
           extra_nix_config: |
             experimental-features = nix-command flakes

flake.lock

@@ -55,11 +55,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1785523697,
-        "narHash": "sha256-8WdoCJDLNR/aLkcmeY8CeAZlTIN8ulG/7N1ZFEVDdsQ=",
+        "lastModified": 1786030193,
+        "narHash": "sha256-Z5rxmZBMJsNsUSb37ljbDMKrtrds9Enw5oPJcf8wbVU=",
         "owner": "logos-co",
         "repo": "logos-protocol",
-        "rev": "3a31c91d1322dae053bbe28b6e3f441fabcc2162",
+        "rev": "0f26ffdeef18fb9582dc0a95e2bee482464da40d",
         "type": "github"
       },
       "original": {