ci: retry transient registry/DNS flakes at the cargo/npm/pip tool level (#105)

The v0.4.0-era CI failure was a runner network blip — `napi build` invokes cargo,
whose fetch of index.crates.io hit "Could not resolve host: index.crates.io" and
failed the Node-on-macOS job, forcing a manual re-run. The earlier flake-hardening
(setup-node/setup-python + rust-cache retries) only covered toolchain download and
cache restore, not the registry fetches inside the actual build/publish steps.

Set tool-level network retries as workflow env so every cargo/napi/maturin/
wasm-pack/npm/pip invocation in every job inherits them — including the nested
cargo calls inside napi/maturin/wasm-pack:

- CARGO_NET_RETRY=10 (default 3): cargo classes DNS-resolve / connect / timeout
  errors as spurious and retries with backoff; 10 attempts ride out a transient
  blip instead of failing the job.
- CARGO_NET_GIT_FETCH_WITH_CLI=true: more robust git-dep fetches.
- npm_config_fetch_retries=5 / maxtimeout=120s: npm ci/install registry retries.
- PIP_RETRIES=5 / PIP_DEFAULT_TIMEOUT=120: pip install resilience.

Applied to ci.yml, release.yml and bench.yml (the workflows that build). No more
manual re-runs for transient registry flakes.

.github/workflows/bench.yml

@@ -31,6 +31,17 @@ permissions:
 
 env:
   CARGO_TERM_COLOR: always
+  # Network-flake resilience: retry transient registry/DNS failures at the tool
+  # level so a blip fetching crates.io / PyPI inside any build step (cargo,
+  # maturin, pip) retries automatically instead of failing the job. Cargo treats
+  # "couldn't resolve host" / connect / timeout as spurious and retries with
+  # backoff; 10 attempts ride out a transient DNS blip on a runner.
+  CARGO_NET_RETRY: "10"
+  CARGO_NET_GIT_FETCH_WITH_CLI: "true"
+  npm_config_fetch_retries: "5"
+  npm_config_fetch_retry_maxtimeout: "120000"
+  PIP_RETRIES: "5"
+  PIP_DEFAULT_TIMEOUT: "120"
 
 jobs:
   cross-library-bench:

.github/workflows/ci.yml

@@ -16,6 +16,19 @@ permissions:
 env:
   CARGO_TERM_COLOR: always
   RUSTFLAGS: "-D warnings"
+  # Network-flake resilience: retry transient registry/DNS failures at the tool
+  # level so a blip fetching crates.io / npm / PyPI inside any build step (cargo,
+  # napi, maturin, wasm-pack, npm ci, pip) retries automatically instead of
+  # failing the job and needing a manual re-run. Cargo treats "couldn't resolve
+  # host" / connect / timeout as spurious and retries with backoff; 10 attempts
+  # ride out a transient DNS blip on a runner. Complements the setup-action /
+  # cache retries (which only covered toolchain download + cache restore).
+  CARGO_NET_RETRY: "10"
+  CARGO_NET_GIT_FETCH_WITH_CLI: "true"
+  npm_config_fetch_retries: "5"
+  npm_config_fetch_retry_maxtimeout: "120000"
+  PIP_RETRIES: "5"
+  PIP_DEFAULT_TIMEOUT: "120"
 
 jobs:
   rust:

.github/workflows/release.yml

@@ -18,6 +18,17 @@ permissions:
 
 env:
   CARGO_TERM_COLOR: always
+  # Network-flake resilience: retry transient registry/DNS failures at the tool
+  # level so a blip fetching crates.io / npm inside any build or publish step
+  # (cargo, napi, maturin, wasm-pack, npm) retries automatically instead of
+  # failing the job. Cargo treats "couldn't resolve host" / connect / timeout as
+  # spurious and retries with backoff; 10 attempts ride out a transient DNS blip.
+  CARGO_NET_RETRY: "10"
+  CARGO_NET_GIT_FETCH_WITH_CLI: "true"
+  npm_config_fetch_retries: "5"
+  npm_config_fetch_retry_maxtimeout: "120000"
+  PIP_RETRIES: "5"
+  PIP_DEFAULT_TIMEOUT: "120"
 
 jobs:
   # --------------------------------------------------------------------------