…ffold

Cuts a patch release combining the two PRs that landed post-v0.31.0 (#907, #908)
plus incidental `cargo fmt --all` normalization across the workspace.

Wire-level changes:
- Workspace + root `aprender` package bumped 0.31.0 → 0.31.1
- All 60+ path-dep pins updated in lockstep so the published crates resolve
  against each other without range-version drift
- `opentelemetry` / `opentelemetry_sdk` / `opentelemetry-otlp` kept at 0.31.0
  (external deps — global sed caught them as false-positives during bump)

CHANGELOG.md covers:
- Fixed: `apr qa` format_parity gate SKIPs non-GGUF primaries (#907)
- Added: `pmcp = "2.3"` optional dep behind `pmcp-dispatcher` feature (#908)

Pre-push gates:
- cargo fmt --all (applied — 45 lines across 17 non-Cargo files)
- cargo test -p aprender-contracts --lib: 1371 passed / 0 failed
- cargo deny check advisories: advisories ok

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

…c-sccache wrapper

The `sovereign-ci:stable` container image is currently missing the
`rustc-sccache` wrapper script, causing every sccache-gated CI job
(ci/test, ci/lint, ci/coverage, ci/gate) to fail at the rustc probe:

    error: could not execute process `rustc-sccache /.../rustc -vV`
      (never executed)
    Caused by: No such file or directory (os error 2)

Reruns fail identically — not transient.

Workaround: flip `enable_sccache: true → false` on this repo's
workflow input. The sovereign-ci reusable workflow reads this to set
`RUSTC_WRAPPER: ${{ inputs.enable_sccache && 'rustc-sccache' || '' }}`,
so disabling it removes the wrapper entirely and CI builds proceed
normally (just slower, since there's no compile cache).

Revert once paiml/.github ships a runner image with the wrapper
present — this is a temporary unblock for the v0.31.1 release PR.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>