Add AirspeedVelocity benchmarking CI

.github/workflows/benchmark.yml

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+name: Benchmark this PR
+
+on:
+  pull_request:
+    branches: [master]
+    paths-ignore: ['docs/**']
+
+permissions:
+  pull-requests: write
+  contents: read
+
+jobs:
+  benchmark:
+    runs-on: ubuntu-latest
+    timeout-minutes: 60
+    strategy:
+      fail-fast: false
+      matrix:
+        version: ["1", "lts"]
+    env:
+      # Force consistent Julia depot path for self-hosted runners
+      JULIA_DEPOT_PATH: ~/.julia
+    steps:
+      - uses: MilesCranmer/AirspeedVelocity.jl@action-v1
+        with:
+          julia-version: ${{ matrix.version }}
+          script: "benchmark/benchmarks.jl"
+          extra-pkgs: ""
+          job-summary: true

benchmark/benchmarks.jl

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+using StructuralIdentifiability, BenchmarkTools
+
+const SUITE = BenchmarkGroup()
+
+# =============================================================================
+# Model construction — linear compartment models
+# =============================================================================
+
+SUITE["construction"] = BenchmarkGroup()
+
+graph3 = [[2], [1, 3], [1, 2]]
+graph4 = [[2, 4], [1, 3], [2, 4], [1, 3]]
+
+SUITE["construction"]["lincomp_3"] = @benchmarkable linear_compartment_model(
+    $graph3; inputs = [1], outputs = [1], leaks = []
+)
+SUITE["construction"]["lincomp_4"] = @benchmarkable linear_compartment_model(
+    $graph4; inputs = [2], outputs = [1], leaks = [2, 3]
+)
+
+# =============================================================================
+# Identifiability assessment — the core workload: differential algebra +
+# rational function field computation
+# =============================================================================
+
+SUITE["identifiability"] = BenchmarkGroup()
+
+ode3 = linear_compartment_model(graph3; inputs = [1], outputs = [1])
+ode4 = linear_compartment_model(graph4; inputs = [2], outputs = [1], leaks = [2, 3])
+
+SUITE["identifiability"]["local_3"] = @benchmarkable assess_local_identifiability($ode3)
+SUITE["identifiability"]["local_4"] = @benchmarkable assess_local_identifiability($ode4)
+SUITE["identifiability"]["global_3"] = @benchmarkable assess_identifiability($ode3) seconds = 600
+
+# =============================================================================
+# IO-equation derivation and identifiable function extraction
+# =============================================================================
+
+SUITE["ioequations"] = BenchmarkGroup()
+
+SUITE["ioequations"]["find_3"] = @benchmarkable find_ioequations($ode3)
+SUITE["ioequations"]["find_4"] = @benchmarkable find_ioequations($ode4)