ci: wire deepnsm into fmt/clippy/test (fmt+test gating, clippy advisory)

deepnsm is a standalone, workspace-excluded codec crate, so the existing
CI jobs (which target crates/lance-graph and the contract crate) never
reached it: `cargo fmt --all`, the workspace clippy, and the test job all
skip it. That is how its formatting silently drifted (28 files, fixed in
dd3d9ce) and ~12 clippy lints (TD-DEEPNSM-CLIPPY-195) accrued unseen.

Wire it in following the repo's established tiered convention:

- style.yml format job: add an explicit `cargo fmt -p deepnsm --check`
  (gating). The crate was brought rustfmt-clean earlier in this PR.
- style.yml clippy job: add deepnsm as a Tier-B advisory step
  (continue-on-error), mirroring lance-graph core. Promote to gating once
  TD-DEEPNSM-CLIPPY-195 is cleared by a focused lint sweep.
- rust-test.yml test job: run the deepnsm test suite (gating); 0-dep and
  fast, ~217 lib + integration + doctests.

crates/** already triggers these workflows, so deepnsm-only changes now
exercise fmt + clippy + test going forward.

https://claude.ai/code/session_014A4JuRCqKP2yNENrQ9Ha7H

Author: claude

.github/workflows/rust-test.yml

@@ -87,6 +87,11 @@ jobs:
         run: cargo test --manifest-path crates/lance-graph-contract/Cargo.toml --tests
       - name: Run contract doctests
         run: cargo test --manifest-path crates/lance-graph-contract/Cargo.toml --doc
+      # deepnsm: standalone 0-dep codec crate, workspace-excluded, so the
+      # lance-graph test steps above never reached it. ~217 lib + integration +
+      # doctests, fast (no lance/datafusion/ndarray deps). Gating.
+      - name: Run deepnsm tests
+        run: cargo test --manifest-path crates/deepnsm/Cargo.toml
 
   test-with-coverage:
     runs-on: ubuntu-24.04

.github/workflows/style.yml

@@ -71,6 +71,15 @@ jobs:
       - name: Clippy lance-graph (advisory)
         continue-on-error: true
         run: cargo clippy --manifest-path crates/lance-graph/Cargo.toml --lib --tests -- -D warnings
+      # Tier B (advisory until incrementally cleaned, non-gating):
+      #   deepnsm is the standalone 0-dep codec crate, workspace-excluded, so it
+      #   was never clippy-checked. It carries ~12 pre-existing default-clippy
+      #   lints (TD-DEEPNSM-CLIPPY-195, clippy 1.95 bump) — mechanical idiom
+      #   lints to be paid down by a focused sweep, same policy as lance-graph
+      #   core. Advisory now; promote to gating once TD-DEEPNSM-CLIPPY-195 clears.
+      - name: Clippy deepnsm (advisory)
+        continue-on-error: true
+        run: cargo clippy --manifest-path crates/deepnsm/Cargo.toml --all-targets -- -D warnings
 
   format:
     runs-on: ubuntu-24.04
@@ -94,8 +103,13 @@ jobs:
       - uses: actions-rust-lang/setup-rust-toolchain@v1
         with:
           components: rustfmt
-      - name: Check formatting
+      - name: Check formatting (lance-graph)
         run: cargo fmt --manifest-path crates/lance-graph/Cargo.toml -- --check
+      # deepnsm is a standalone, workspace-excluded codec crate, so
+      # `cargo fmt --all` never reaches it. It was brought to a rustfmt-clean
+      # baseline in this PR; check it explicitly so it can't silently drift.
+      - name: Check formatting (deepnsm)
+        run: cargo fmt --manifest-path crates/deepnsm/Cargo.toml -- --check
 
   # typos / spell-check removed 2026-04-26: too many false positives on
   # technical jargon (NARS terms, codec acronyms, German loanwords used in