Two CI fixes; the previous `enablement: true` attempt didn't work
because the default GITHUB_TOKEN can write to Pages but can't enable
it on a repo that doesn't yet have it configured.
1. .github/workflows/docs.yml: drop the Pages deploy job entirely.
Build mdbook on every push and upload it as a CI artifact. When
Pages is enabled manually (Settings → Pages → 'Build and
deployment: GitHub Actions'), this file can grow back a deploy
job using actions/configure-pages + actions/deploy-pages.
2. fuzz/fuzz_targets/clamp_to_bounds.rs: the simplex projection's τ
computation operates on values up to `simplex_total · 1e6` per
the input filter, so its FP precision floor is ~1e-4 of the
input scale. Outputs near the `max(x_i − τ, 0)` clamp boundary
can flip between 0 and a small positive value across
re-applications without that being a correctness bug. The fuzz
target is meant to catch *gross* non-idempotence (the all-zeros
bug that the v0.4 cleanup fixed), not ULP-level slop. Loosen the
per-element tolerance to `1e-4 · max(simplex_total, max|x_i|, 1)`.
Verified clean over a 10 M-run soak.
swaits