feat(skills): always_inject belongs beside the skill, not in one database

Migration 0083 added the column for a measured failure — under the `index`
arm, `workspace-repo-commit-protocol` scored Trigger=FAIL while its boundary
check passed, because a rule that applies to everyone who writes reads to each
agent as nobody's in particular. The column shipped and was never set: prod ran
0 of 53 skills flagged, and the post-v0.8.5 validation mission made 76 tool
calls with ZERO ReadMcpResourceTool among them. Not plumbing — the door
answered 200 from inside that container, and the agents used ToolSearch four
times to reach for other tools they did not have.

Setting it by hand fixes one database. A rebuilt one comes up un-flagged, with
nothing in the repo recording that the skill was ever meant to be injected —
the same shape as every silent-success defect in this project.

So the frontmatter carries it, the loader parses it, and the upsert writes it.
The file wins on conflict: builtins are code-managed, and a setting that exists
only in one database is a setting nobody can find.

Guarded both ways. `always_inject` defaults FALSE, because defaulting true
would quietly abolish the index arm rather than fix it; and a test asserts the
shipped skill still carries the flag, verified by flipping it to false and
watching the test fail.

Co-Authored-By: Claude Opus 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01WZb5A2kfVfjpdwSochkuHz

crates/cm-api/src/skills_loader.rs

@@ -7,6 +7,13 @@
 //!   description: <one-line, shown to the LLM in resources/list>
 //!   when_to_use: <trigger sentence, appended to description>
 //!   tags: [foundation, rust, ...]
+//!   always_inject: true   # optional, default false
+//!
+//! `always_inject` makes the body reach the agent in full even under the
+//! `index` (progressive-disclosure) arm. It is for a CROSS-CUTTING procedure —
+//! one that applies to everyone who writes, and so reads to each agent as
+//! nobody's in particular, which is how `workspace-repo-commit-protocol`
+//! scored Trigger=FAIL beside a passing boundary check.
 //!
 //! The body is the rest of the file. Both are upserted idempotently:
 //! `skills_catalog::upsert_builtin` bumps the version + appends to
@@ -27,6 +34,8 @@ struct Frontmatter {
     when_to_use: Option<String>,
     #[serde(default)]
     tags: Vec<String>,
+    #[serde(default)]
+    always_inject: bool,
 }
 
 fn skills_dir() -> PathBuf {
@@ -120,6 +129,7 @@ async fn load_one(pool: &PgPool, path: &std::path::Path) -> Result<String, Strin
         when_to_use: fm.when_to_use.as_deref(),
         tags: fm.tags.clone(),
         body,
+        always_inject: fm.always_inject,
     };
     upsert_builtin(pool, skill)
         .await
@@ -158,6 +168,36 @@ mod tests {
         assert!(split_frontmatter("# plain md\n").is_none());
     }
 
+    #[test]
+    fn always_inject_is_opt_in_and_parses() {
+        let off: Frontmatter = serde_yaml::from_str("name: a\ndescription: b\n").unwrap();
+        assert!(
+            !off.always_inject,
+            "full delivery must be opted INTO — defaulting true would abolish the index arm"
+        );
+        let on: Frontmatter =
+            serde_yaml::from_str("name: a\ndescription: b\nalways_inject: true\n").unwrap();
+        assert!(on.always_inject);
+    }
+
+    /// The flag reached production as a hand-run UPDATE first, which a rebuilt
+    /// database would have silently dropped. This asserts the repo carries it,
+    /// so the cross-cutting skill cannot go back to being deliverable only by
+    /// an agent noticing it applies — the exact failure it was measured on.
+    #[test]
+    fn the_commit_protocol_ships_marked_for_full_delivery() {
+        let path = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"))
+            .join("../../skills/foundation/workspace-repo-commit-protocol.md");
+        let text = std::fs::read_to_string(&path).expect("read the commit-protocol skill");
+        let (yaml, _) = split_frontmatter(&text).expect("frontmatter");
+        let fm: Frontmatter = serde_yaml::from_str(yaml).expect("parse frontmatter");
+        assert!(
+            fm.always_inject,
+            "workspace-repo-commit-protocol must be always_inject: it applies to everyone \
+             who writes, and under the index arm it scored Trigger=FAIL unread"
+        );
+    }
+
     #[test]
     fn builtin_id_stable() {
         assert_eq!(