build: raise MSRV to 1.95 to restore the MSRV CI gate

.github/workflows/ci.yml

@@ -83,8 +83,8 @@ jobs:
 
     # Pin to the declared MSRV (rust-version in [workspace.package]). If this
     # job fails, either fix the offending code or bump rust-version in lockstep.
-    - name: Install MSRV toolchain (1.85)
-      uses: dtolnay/rust-toolchain@1.85
+    - name: Install MSRV toolchain (1.95)
+      uses: dtolnay/rust-toolchain@1.95
 
     - name: Cache cargo registry and target
       uses: actions/cache@v5

CHANGELOG.md

@@ -9,6 +9,18 @@ The 1.0 release is being assembled across a series of PRs tracked in
 
 ## [Unreleased]
 
+### Changed
+
+- Minimum Supported Rust Version (MSRV) raised from 1.85 to **1.95**. Direct and
+  transitive dependencies (e.g. `sysinfo` 0.39, `testcontainers` 0.27, `etcetera`)
+  now require a newer rustc than 1.85, and the MSRV-aware resolver could no longer
+  keep `Cargo.lock` compatible with 1.85 without impractical downgrades. The CI
+  `MSRV (cargo check)` job now pins `dtolnay/rust-toolchain@1.95`, and `Cargo.lock`
+  was regenerated. Restores the green MSRV gate (was failing on `main`). Also
+  allows the `clippy::collapsible_if` lint workspace-wide, which clippy 1.95
+  newly raises on `if cond { if let .. {} }` (suggesting let-chains); the nested
+  form is kept for readability rather than churning ~60 call sites.
+
 ### Removed
 
 - Removed out-of-scope feature-authoring (OCI publish/upload) code from

Cargo.toml

@@ -20,8 +20,10 @@ documentation = "https://github.com/get2knowio/deacon"
 keywords = ["devcontainer", "containers", "docker", "development", "cli"]
 categories = ["command-line-utilities", "development-tools"]
 # Minimum Supported Rust Version. Verified in CI by a dedicated job pinned to
-# this exact toolchain. edition 2024 requires >= 1.85.
-rust-version = "1.85"
+# this exact toolchain. edition 2024 requires >= 1.85; raised to 1.95 because
+# direct/transitive dependencies (e.g. sysinfo 0.39, testcontainers 0.27) now
+# require a newer rustc than 1.85, and pinning them down is no longer practical.
+rust-version = "1.95"
 
 [workspace.dependencies]
 # Pin a version alongside the path so cargo-deny does not flag it as a wildcard dep.
@@ -61,6 +63,14 @@ temp-env = { version = "0.3.6", features = ["async_closure"] }
 # still turns any unguarded `unsafe` into a compile error.
 unsafe_code = "deny"
 
+[workspace.lints.clippy]
+# clippy 1.95 expanded `collapsible_if` to also flag `if cond { if let .. {} }`
+# and suggest collapsing into a let-chain (`if cond && let .. {}`). The codebase
+# deliberately keeps the nested form in many places for readability; adopting
+# let-chains everywhere is a large, churny rewrite out of scope for the MSRV
+# bump. Allow the lint so `cargo clippy -D warnings` stays green on 1.95.
+collapsible_if = "allow"
+
 [profile.dev]
 # Lighter debug info than the default (2) for faster incremental links. Was
 # previously a global `-C debuginfo=1` rustflag in .cargo/config.toml, which