diff --git a/.cargo/audit.toml b/.cargo/audit.toml
index 68c9e30..0dcd9cf 100644
--- a/.cargo/audit.toml
+++ b/.cargo/audit.toml
@@ -8,4 +8,8 @@
 ignore = [
     # paste unmaintained — transitive via tokenizers/spm_precompiled
     "RUSTSEC-2024-0436",
+    # name collision — `cache` here is this workspace's crates/cache path dependency, not the abandoned crates.io crate
+    "RUSTSEC-2020-0128",
+    # name collision — `cache` here is this workspace's crates/cache path dependency, not the abandoned crates.io crate
+    "RUSTSEC-2021-0006",
 ]
diff --git a/.github/workflows/security.yml b/.github/workflows/security.yml
index d7d9e11..ec92e7c 100644
--- a/.github/workflows/security.yml
+++ b/.github/workflows/security.yml
@@ -57,3 +57,17 @@ jobs:
         run: cargo install cargo-audit --locked --version ^0.22
       - name: cargo audit
         run: cargo audit --deny unmaintained --deny unsound --deny yanked
+
+  # WHY the reusable workflow rather than the scanner action: the action's own
+  # description recommends it, and warns the action's behaviour may change in a
+  # minor patch update. This repo can use it now that Cargo.lock is committed --
+  # the scan-args reference a lockfile that must exist on disk after checkout.
+  osv-scanner:
+    name: osv scanner
+    uses: google/osv-scanner-action/.github/workflows/osv-scanner-reusable.yml@9a498708959aeaef5ef730655706c5a1df1edbc2
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+    with:
+      scan-args: '--config=osv-scanner.toml --lockfile=Cargo.lock'
diff --git a/.gitignore b/.gitignore
index 1458a74..00b0b1a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,7 +3,13 @@
 **/*.rs.bk
 
 # Cargo
-Cargo.lock
+#
+# WHY Cargo.lock IS committed here: it was ignored by inheritance rather than by
+# decision -- the line arrived in the initial public snapshot with no stated
+# reason, while every other Rust workspace in the fleet commits its lockfile.
+# Committing it makes `--locked` builds reproducible and gives the OSV scanner
+# something to scan; without it that job finds no lockfile and fails on every
+# run rather than reporting anything.
 
 # Editor / OS cruft
 .DS_Store
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..1d161a1
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,1280 @@
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+version = "1.0.4+wasi-0.2.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b67efb37e106e55ce722a510d6b5f9c17f083e5fc79afc2badeb12cc313d9487"
+dependencies = [
+ "wit-bindgen",
+]
+
+[[package]]
+name = "windows-link"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f0805222e57f7521d6a62e36fa9163bc891acd422f971defe97d64e70d0a4fe5"
+
+[[package]]
+name = "windows-sys"
+version = "0.61.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ae137229bcbd6cdf0f7b80a31df61766145077ddf49416a728b02cb3921ff3fc"
+dependencies = [
+ "windows-link",
+]
+
+[[package]]
+name = "wit-bindgen"
+version = "0.57.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1ebf944e87a7c253233ad6766e082e3cd714b5d03812acc24c318f549614536e"
+
+[[package]]
+name = "zerocopy"
+version = "0.8.56"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "556764e583adb45a9f8d413c2a147fa7e8d821e48e12b14fd560b607998b75eb"
+dependencies = [
+ "zerocopy-derive",
+]
+
+[[package]]
+name = "zerocopy-derive"
+version = "0.8.56"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f2ab42fc20575779bd240faa45f94a74256f755c0fa9e89f0ede20d91d0cdfc1"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.119",
+]
+
+[[package]]
+name = "zmij"
+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "29666d0abbfad1e3dc4dcf6144730dd3a3ab225bbbdac83319345b1b44ccfc1b"
diff --git a/deny.toml b/deny.toml
index 84c3ed5..08ee9e9 100644
--- a/deny.toml
+++ b/deny.toml
@@ -12,6 +12,23 @@ all-features = false
 id = "RUSTSEC-2024-0436"
 reason = "paste unmaintained — transitive via tokenizers/spm_precompiled"
 
+# RUSTSEC-2020-0128 and RUSTSEC-2021-0006 are NAME COLLISIONS, not findings. Both
+# advisories concern an abandoned crates.io crate called `cache`. The `cache 1.0.9`
+# in this lockfile is THIS workspace's own crate at crates/cache -- its lockfile
+# entry carries no `source` and no `checksum`, which is what a path dependency
+# looks like and what a registry crate never looks like.
+#
+# Scanners that match on name alone cannot tell the two apart. aletheia's
+# .cargo/audit.toml already carries the same pair with the same reasoning, so this
+# is a known class rather than a new judgement.
+[[advisories.ignore]]
+id = "RUSTSEC-2020-0128"
+reason = "name collision — `cache` here is this workspace's crates/cache path dependency, not the abandoned crates.io crate"
+
+[[advisories.ignore]]
+id = "RUSTSEC-2021-0006"
+reason = "name collision — `cache` here is this workspace's crates/cache path dependency, not the abandoned crates.io crate"
+
 [licenses]
 allow = [
     "MIT",
diff --git a/osv-scanner.toml b/osv-scanner.toml
index 95dcbe0..815c5d8 100644
--- a/osv-scanner.toml
+++ b/osv-scanner.toml
@@ -5,3 +5,11 @@
 [[IgnoredVulns]]
 id = "RUSTSEC-2024-0436"
 reason = "paste unmaintained — transitive via tokenizers/spm_precompiled"
+
+[[IgnoredVulns]]
+id = "RUSTSEC-2020-0128"
+reason = "name collision — `cache` here is this workspace's crates/cache path dependency, not the abandoned crates.io crate"
+
+[[IgnoredVulns]]
+id = "RUSTSEC-2021-0006"
+reason = "name collision — `cache` here is this workspace's crates/cache path dependency, not the abandoned crates.io crate"