RIG-401 feat: implementation (#236)

## Summary
Pipeline engineer task `20260407-039`.

Linear: RIG-401

Author: ArLeyar

engine/pipelines/default.yaml

@@ -6,6 +6,8 @@ launch_stagger_secs: 4
 templates:
   verdict_instruction: "Output your verdict on the LAST line of your response"
   nit_threshold: "0"
+  language: rust
+  test_commands: "make check"
 
 stages:
   analyst:

engine/pipelines/economy.yaml

@@ -6,6 +6,8 @@ launch_stagger_secs: 4
 templates:
   verdict_instruction: "Output your verdict on the LAST line of your response"
   nit_threshold: "0"
+  language: rust
+  test_commands: "make check"
 
 stages:
   analyst:

engine/pipelines/honeyjourney.yaml

@@ -6,6 +6,8 @@ launch_stagger_secs: 4
 templates:
   verdict_instruction: "Output your verdict on the LAST line of your response"
   nit_threshold: "0"
+  language: python
+  test_commands: "make check"
 
 stages:
   analyst:

engine/pipelines/prompts/engineer.md

@@ -21,22 +21,14 @@ You are implementing changes for a Linear issue. You may be:
 1. **Starting fresh** — the analyst spec is in the handoff context file
 2. **Fixing rejection** — the reviewer found issues listed above in "Rejection Feedback"
 
-### FIRST: Invoke the Rust skill
-Before writing any code, invoke the `/rust` skill using the Skill tool. This loads Rust-specific patterns, testing workflow, and quality standards that you MUST follow throughout implementation.
+{skill_section}
 
 ### Workflow
-1. Invoke `/rust` skill (Skill tool, skill: "rust")
-2. Read the handoff context file and any rejection feedback
-3. Implement the changes (or fix the issues raised by the reviewer)
-4. **Pre-commit verification — ALL must pass before committing:**
-   ```bash
-   cargo fmt
-   cargo clippy -- -D warnings
-   cargo test
-   ```
-   Fix every error before proceeding. Do NOT commit if any step fails.
-5. Stage and commit with conventional commit format: `RIG-XX type: description`
-6. Push: `git push -u origin HEAD`
+1. Read the handoff context file and any rejection feedback
+2. Implement the changes (or fix the issues raised by the reviewer)
+3. {verification_section}
+4. {commit_format_hint}
+5. Push: `git push -u origin HEAD`
 
 IMPORTANT: Do NOT call `gh pr create`, `gh pr merge`, or any other `gh` write commands directly. The pipeline engine handles PR creation and all GitHub mutations automatically after your task completes. Your job is to write code, commit, and push.
 

engine/src/pipeline/callback/task_builder.rs

@@ -346,6 +346,9 @@ pub(super) fn build_handoff_prompt(
         }
     };
 
+    // RIG-401: inject agent_runtime so computed vars (skill_section, etc.) are runtime-aware.
+    let agent_runtime = stage_cfg.runtime.unwrap_or_default().to_string();
+
     let mut runtime: HashMap<String, String> = HashMap::new();
     runtime.insert("issue_id".to_string(), issue_identifier.to_string());
     runtime.insert("issue_title".to_string(), issue_title.to_string());
@@ -363,6 +366,7 @@ pub(super) fn build_handoff_prompt(
         previous_review.unwrap_or_default().to_string(),
     );
     runtime.insert("working_dir".to_string(), String::new());
+    runtime.insert("agent_runtime".to_string(), agent_runtime);
 
     let vars = build_vars(&config.templates, &runtime);
     let mut rendered = render_prompt(&prompt_source, &vars);

engine/src/pipeline/poll.rs

@@ -1290,11 +1290,15 @@ pub(crate) fn build_poll_prompt(
     let previous_review =
         super::callback::lookup_previous_reviewer_handoff(db, identifier).unwrap_or_default();
 
+    // RIG-401: inject agent_runtime so computed vars (skill_section, etc.) are runtime-aware.
+    let agent_runtime = stage_cfg.runtime.unwrap_or_default().to_string();
+
     let mut runtime: HashMap<String, String> = HashMap::new();
     runtime.insert("issue_id".to_string(), identifier.to_string());
     runtime.insert("issue_title".to_string(), title.to_string());
     runtime.insert("issue_description".to_string(), description.to_string());
     runtime.insert("previous_review".to_string(), previous_review);
+    runtime.insert("agent_runtime".to_string(), agent_runtime);
 
     let vars = build_vars(&config.templates, &runtime);
     render_prompt(&prompt_source, &vars)