build: lift MSRV to 1.80 workspace / 1.88 node binding

The previous MSRV pins were below what current transitive dependencies
need:

  - rayon-core 1.13.0 (pulled in by the optional `parallel` feature on
    wickra-core via rayon) requires rustc >= 1.80; under the old 1.75
    workspace MSRV the CI MSRV job broke with "package `rayon-core
    v1.13.0` cannot be built because it requires rustc 1.80 or newer".
  - napi-build 2.3.2 (the build-script crate that napi-derive 2.x calls
    into) requires rustc >= 1.88; under the old 1.77 node-binding MSRV
    the CI MSRV-node job broke with "package `napi-build v2.3.2` cannot
    be built because it requires rustc 1.88 or newer".

Pinning the deps backwards would have frozen us out of upstream
security/fix releases for both crates. Lifting the MSRV is the cleaner
path for a young 0.x library — downstream consumers on older toolchains
can stay on the already-published 0.2.0.

Updated:
  - Cargo.toml workspace rust-version 1.75 -> 1.80
  - bindings/node/Cargo.toml rust-version 1.77 -> 1.88
  - .github/workflows/ci.yml MSRV matrix names + toolchain values + comment
  - CHANGELOG.md [Unreleased] documents the bump

.github/workflows/ci.yml

@@ -56,9 +56,12 @@ jobs:
         run: cargo build -p wickra-examples --bins
 
   # Verify the crates still build and test on their declared minimum supported
-  # Rust version. The workspace pins rust-version = "1.75"; bindings/node needs
+  # Rust version. The workspace pins rust-version = "1.80" (raised from 1.75
-  # 1.77 because napi-build emits `cargo::` directives. Without this job an
+  # so rayon-core >= 1.13.0 keeps compiling); bindings/node pins
-  # accidental use of a newer API would only surface for downstream users.
+  # rust-version = "1.88" because napi-build 2.3.2 requires it (and that
+  # subsumes the older 1.77 floor needed for `cargo::` directives). Without
+  # this job an accidental use of a newer API would only surface for
+  # downstream users.
   msrv:
     name: ${{ matrix.name }}
     runs-on: ubuntu-latest
@@ -66,11 +69,11 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - name: MSRV workspace (Rust 1.75)
+          - name: MSRV workspace (Rust 1.80)
-            toolchain: "1.75"
+            toolchain: "1.80"
             packages: "-p wickra-core -p wickra -p wickra-data"
-          - name: MSRV node binding (Rust 1.77)
+          - name: MSRV node binding (Rust 1.88)
-            toolchain: "1.77"
+            toolchain: "1.88"
             packages: "-p wickra-node"
     steps:
       - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1

CHANGELOG.md

@@ -7,6 +7,17 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+- **MSRV bumped.** Workspace minimum supported Rust version is now **1.80**
+  (was 1.75) and the Node binding (`wickra-node`) is now **1.88** (was 1.77).
+  The bumps are driven by transitive-dependency floors that were lifted in
+  recent updates: `rayon-core >= 1.13.0` requires Rust 1.80, and
+  `napi-build >= 2.3.2` requires Rust 1.88. Pinning the deps to the older
+  versions would have frozen us out of future security fixes from those
+  upstreams, so lifting the MSRV is the cleaner path for a young 0.x
+  library. Downstream consumers on older Rust toolchains can stay on
+  Wickra 0.2.0.
+
 ## [0.2.0] - 2026-05-23
 
 ### Fixed

Cargo.toml

@@ -15,7 +15,7 @@ exclude = ["fuzz"]
 version = "0.2.0"
 authors = ["kingchenc <kingchencp@gmail.com>"]
 edition = "2021"
-rust-version = "1.75"
+rust-version = "1.80"
 license = "PolyForm-Noncommercial-1.0.0"
 repository = "https://github.com/kingchenc/wickra"
 homepage = "https://github.com/kingchenc/wickra"

bindings/node/Cargo.toml

@@ -4,9 +4,11 @@ description = "Node.js bindings for the Wickra streaming-first technical indicat
 version.workspace = true
 authors.workspace = true
 edition.workspace = true
-# napi-build emits `cargo::` directives that require Rust >= 1.77; the rest of
+# napi-build 2.3.2 requires Rust >= 1.88 (newer than the workspace 1.80
-# the workspace stays at 1.75 because the core crate has no such dependency.
+# minimum, which itself was lifted to satisfy rayon-core 1.13.0). napi-build
-rust-version = "1.77"
+# also emits `cargo::` directives that require >= 1.77 — that older floor is
+# subsumed by the 1.88 requirement now.
+rust-version = "1.88"
 license.workspace = true
 repository.workspace = true
 homepage.workspace = true