tracing: Emit native journal MESSAGE_ID for lifecycle events

bootc already routes INFO tracing events to the journal (when run as
root), and a number of lifecycle events carry a `message_id` field with
a hardcoded 128-bit hex constant, intended to populate systemd's
well-known MESSAGE_ID so operators can query e.g.
`journalctl MESSAGE_ID=<id>` and hook the message catalog.

Two defects prevented this from working:

  - tracing-journald prefixes all custom fields with `F_`, so the field
    landed as `F_MESSAGE_ID` rather than the native MESSAGE_ID, and
    `bootc.image.reference` as `F_BOOTC_IMAGE_REFERENCE`. Dropping the
    prefix (with_field_prefix(None)) lets the layer's name sanitizer map
    `message_id` -> MESSAGE_ID and `bootc.image.reference` ->
    BOOTC_IMAGE_REFERENCE, while MESSAGE is left untouched.

  - many of the id constants were 33 hex chars (132-bit), which systemd
    rejects as a malformed MESSAGE_ID. Regenerate them as valid, unique
    128-bit values (this also removes two accidental duplicates).

Prep for the unified-storage upgrade fix, which relies on these events
being usefully queryable in the journal.

Assisted-by: opencode (Claude Opus 4.8)
Signed-off-by: Colin Walters <walters@verbum.org>

Author: cgwalters

crates/lib/src/bootc_composefs/boot.rs

@@ -1324,7 +1324,7 @@ pub(crate) async fn setup_composefs_boot(
     pull_result: &composefs_oci::PullResult<Sha512HashValue>,
     allow_missing_fsverity: bool,
 ) -> Result<()> {
-    const COMPOSEFS_BOOT_SETUP_JOURNAL_ID: &str = "1f0e9d8c7b6a5f4e3d2c1b0a9f8e7d6c5";
+    const COMPOSEFS_BOOT_SETUP_JOURNAL_ID: &str = "ed426a753d3f4d698528c0228449de3f";
 
     tracing::info!(
         message_id = COMPOSEFS_BOOT_SETUP_JOURNAL_ID,

crates/lib/src/bootc_composefs/delete.rs

@@ -208,7 +208,7 @@ pub(crate) async fn delete_composefs_deployment(
     storage: &Storage,
     booted_cfs: &BootedComposefs,
 ) -> Result<()> {
-    const COMPOSEFS_DELETE_JOURNAL_ID: &str = "2a1f0e9d8c7b6a5f4e3d2c1b0a9f8e7d6";
+    const COMPOSEFS_DELETE_JOURNAL_ID: &str = "52b55a65303244158335bfd03007bbc4";
 
     tracing::info!(
         message_id = COMPOSEFS_DELETE_JOURNAL_ID,

crates/lib/src/bootc_composefs/finalize.rs

@@ -53,7 +53,7 @@ pub(crate) async fn composefs_backend_finalize(
     storage: &Storage,
     booted_cfs: &BootedComposefs,
 ) -> Result<()> {
-    const COMPOSEFS_FINALIZE_JOURNAL_ID: &str = "0e9d8c7b6a5f4e3d2c1b0a9f8e7d6c5b4";
+    const COMPOSEFS_FINALIZE_JOURNAL_ID: &str = "a0f2b2cf274c4239b4b2a8c0f278c2cf";
 
     tracing::info!(
         message_id = COMPOSEFS_FINALIZE_JOURNAL_ID,

crates/lib/src/bootc_composefs/gc.rs

@@ -219,7 +219,7 @@ pub(crate) async fn composefs_gc(
     booted_cfs: &BootedComposefs,
     gc_opts: GCOpts,
 ) -> Result<GcResult> {
-    const COMPOSEFS_GC_JOURNAL_ID: &str = "3b2a1f0e9d8c7b6a5f4e3d2c1b0a9f8e7";
+    const COMPOSEFS_GC_JOURNAL_ID: &str = "09ef238c077343fc9ac0fb82cb56a387";
 
     tracing::info!(
         message_id = COMPOSEFS_GC_JOURNAL_ID,

crates/lib/src/bootc_composefs/repo.rs

@@ -79,7 +79,7 @@ pub(crate) async fn initialize_composefs_repository(
     allow_missing_fsverity: bool,
     use_unified: bool,
 ) -> Result<PullResult<Sha512HashValue>> {
-    const COMPOSEFS_REPO_INIT_JOURNAL_ID: &str = "5d4c3b2a1f0e9d8c7b6a5f4e3d2c1b0a9";
+    const COMPOSEFS_REPO_INIT_JOURNAL_ID: &str = "3cae9eff71b64f50b63d856a02ba217c";
 
     let rootfs_dir = &root_setup.physical_root;
     let image_name = &state.source.imageref.name;
@@ -278,7 +278,7 @@ pub(crate) async fn pull_composefs_repo(
     allow_missing_fsverity: bool,
     use_unified: bool,
 ) -> Result<PullRepoResult> {
-    const COMPOSEFS_PULL_JOURNAL_ID: &str = "4c3b2a1f0e9d8c7b6a5f4e3d2c1b0a9f8";
+    const COMPOSEFS_PULL_JOURNAL_ID: &str = "bd0a8ed0d5004a1e9d6ba429992c2eb7";
 
     let imgref = spec_imgref.to_image_proxy_ref()?;
 

crates/lib/src/bootc_composefs/rollback.rs

@@ -186,7 +186,7 @@ pub(crate) async fn composefs_rollback(
     storage: &Storage,
     booted_cfs: &BootedComposefs,
 ) -> Result<()> {
-    const COMPOSEFS_ROLLBACK_JOURNAL_ID: &str = "6f5e4d3c2b1a0f9e8d7c6b5a4e3d2c1b0";
+    const COMPOSEFS_ROLLBACK_JOURNAL_ID: &str = "4337b7d6663e42d09ba176075646922b";
 
     tracing::info!(
         message_id = COMPOSEFS_ROLLBACK_JOURNAL_ID,

crates/lib/src/bootc_composefs/switch.rs

@@ -38,7 +38,7 @@ pub(crate) async fn switch_composefs(
         anyhow::bail!("Target image is undefined")
     };
 
-    const COMPOSEFS_SWITCH_JOURNAL_ID: &str = "7a6b5c4d3e2f1a0b9c8d7e6f5a4b3c2d1";
+    const COMPOSEFS_SWITCH_JOURNAL_ID: &str = "087ccc03481a477b83c0f6ba62500724";
 
     tracing::info!(
         message_id = COMPOSEFS_SWITCH_JOURNAL_ID,

crates/lib/src/bootc_composefs/update.rs

@@ -344,7 +344,7 @@ pub(crate) async fn upgrade_composefs(
     storage: &Storage,
     composefs: &BootedComposefs,
 ) -> Result<()> {
-    const COMPOSEFS_UPGRADE_JOURNAL_ID: &str = "9c8d7f6e5a4b3c2d1e0f9a8b7c6d5e4f3";
+    const COMPOSEFS_UPGRADE_JOURNAL_ID: &str = "01fcba11aadb493c9226158e896a069e";
 
     tracing::info!(
         message_id = COMPOSEFS_UPGRADE_JOURNAL_ID,

crates/lib/src/boundimage.rs

@@ -40,7 +40,7 @@ pub(crate) struct ResolvedBoundImage {
 /// Given a deployment, pull all container images it references.
 pub(crate) async fn pull_bound_images(sysroot: &Storage, deployment: &Deployment) -> Result<()> {
     // Log the bound images operation to systemd journal
-    const BOUND_IMAGES_JOURNAL_ID: &str = "1a0b9c8d7e6f5a4b3c2d1e0f9a8b7c6d5";
+    const BOUND_IMAGES_JOURNAL_ID: &str = "0c1b3a5e81784fcf9484770bce6acd8a";
     tracing::info!(
         message_id = BOUND_IMAGES_JOURNAL_ID,
         bootc.deployment.osname = deployment.osname().as_str(),

crates/lib/src/cli.rs

@@ -1395,7 +1395,7 @@ async fn switch_ostree(
     }
 
     // Log the switch operation to systemd journal
-    const SWITCH_JOURNAL_ID: &str = "7a6b5c4d3e2f1a0b9c8d7e6f5a4b3c2d1";
+    const SWITCH_JOURNAL_ID: &str = "62d26891bbd54962999b0530b8b62239";
     let old_image = host
         .spec
         .image