ci: set least-privilege top-level token permissions (P21.1b) (#103)

The auto-injected GITHUB_TOKEN defaulted to write-all in ci.yml, bench.yml
and release.yml (no top-level permissions block), and codeql.yml declared
its scopes only at job level. Add a top-level `permissions: contents: read`
to all four so the token starts read-only and only the jobs that genuinely
write through it raise the scope:

- release.yml: github-release keeps contents: write; node-/wasm-publish and
  attestations keep their id-token / attestations: write blocks. The
  cargo/python/node publish jobs push to crates.io/PyPI/npm via their own
  registry secrets, not the GITHUB_TOKEN, so read-only is correct for them.
- codeql.yml: analyze keeps security-events: write (job level).
- ci.yml / bench.yml: no job writes back to the repo (coverage uploads via
  CODECOV_TOKEN; bench only uploads an artifact), so no job override is needed.

sync-about.yml already had a top-level block but at contents: write; demote
the top level to read and move contents: write down to the single `sync` job
(the PR-head counter push is the only GITHUB_TOKEN write). The cross-repo
About/docs/webpage/org writes are unaffected — they run through the
fine-grained ABOUT_SYNC_TOKEN, which the permissions key does not govern.

Raises OpenSSF Scorecard Token-Permissions from 0 toward 10.

.github/workflows/codeql.yml

@@ -12,6 +12,13 @@ on:
   schedule:
     - cron: '31 3 * * 0' # Sundays 03:31 UTC
 
+# Least-privilege default for the auto-injected GITHUB_TOKEN. The analyze job
+# raises exactly the scopes CodeQL needs (security-events: write to upload
+# results) in its own job-level block below; this top-level read-only default
+# covers any future job (OpenSSF Scorecard: Token-Permissions).
+permissions:
+  contents: read
+
 jobs:
   analyze:
     name: Analyze (${{ matrix.language }})