fix: drop source-map.json from agent orientation bundle

The orientation bundle was 96 KB per coder spawn with 85 KB of that being
source-map.json — a static symbol listing that drowned out the workflow rules
in AGENT.md and likely explains why PLAN.md ceremony is being skipped (the
instruction is ~5% of the bundle, buried under a wall of symbols). Agents are
excellent at grep on demand, so the source map adds little value as a preloaded
cheat sheet. File stays on disk for the merge-time source-map-check doc-coverage
gate.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

server/src/agents/local_prompt.rs

@@ -10,10 +10,12 @@
 //! - `.huskies/README.md`
 //! - `.huskies/specs/00_CONTEXT.md`
 //! - `.huskies/AGENT.md`
-//! - `.huskies/source-map.json` (up to 200 KB; truncated with a log if larger)
 //!
-//! `STACK.md` is intentionally excluded — it is large and changes often; agents
+//! `STACK.md` and `.huskies/source-map.json` are intentionally excluded — they
-//! should grep it on demand.
+//! are large and change often; agents should grep on demand instead.  Earlier
+//! versions of this bundle inlined the source map, which ballooned the orientation
+//! to ~96 KB and drowned out the workflow rules in AGENT.md; the file is still
+//! kept on disk for the merge-time `source-map-check` doc-coverage gate.
 //!
 //! Behaviour contract:
 //! - Files that are missing or empty are skipped silently (no error, no section).
@@ -33,12 +35,6 @@ const ORIENTATION_FILES: &[&str] = &[
     ".huskies/AGENT.md",
 ];
 
-/// Path to the source map (relative to project root), appended after AGENT.md.
-const SOURCE_MAP_REL: &str = ".huskies/source-map.json";
-
-/// Maximum bytes of source-map content to embed in the prompt.
-const SOURCE_MAP_BYTE_CAP: usize = 200 * 1024;
-
 /// Attempt to load the project-local agent prompt by concatenating orientation
 /// files from the project root.
 ///
@@ -60,14 +56,11 @@ pub fn read_project_local_prompt(project_root: &Path) -> Option<String> {
         sections.push((rel_path, trimmed.to_string()));
     }
 
-    // Read source-map.json (after AGENT.md) with a byte cap.
+    if sections.is_empty() {
-    let source_map_content = read_source_map_section(project_root);
-
-    if sections.is_empty() && source_map_content.is_none() {
         return None;
     }
 
-    let mut included_files: Vec<&str> = sections.iter().map(|(name, _)| *name).collect();
+    let included_files: Vec<&str> = sections.iter().map(|(name, _)| *name).collect();
     let mut bundle = String::new();
     for (i, (name, content)) in sections.iter().enumerate() {
         if i > 0 {
@@ -77,15 +70,6 @@ pub fn read_project_local_prompt(project_root: &Path) -> Option<String> {
         bundle.push_str(content);
     }
 
-    if let Some(sm) = source_map_content {
-        if !bundle.is_empty() {
-            bundle.push('\n');
-        }
-        bundle.push_str(&format!("=== {SOURCE_MAP_REL} ===\n"));
-        bundle.push_str(&sm);
-        included_files.push(SOURCE_MAP_REL);
-    }
-
     crate::slog!(
         "[agents] orientation bundle: {} bytes, files: [{}]",
         bundle.len(),
@@ -95,39 +79,6 @@ pub fn read_project_local_prompt(project_root: &Path) -> Option<String> {
     Some(bundle)
 }
 
-/// Read `.huskies/source-map.json` from `project_root`, applying a byte cap.
-///
-/// Returns `None` when the file is absent, unreadable, or empty.
-/// When the content exceeds [`SOURCE_MAP_BYTE_CAP`], truncates at a char
-/// boundary and logs the truncation.
-#[allow(clippy::string_slice)] // cap is walked back to a char boundary before slicing
-fn read_source_map_section(project_root: &Path) -> Option<String> {
-    let path = project_root.join(SOURCE_MAP_REL);
-    let Ok(content) = std::fs::read_to_string(&path) else {
-        return None;
-    };
-    let trimmed = content.trim();
-    if trimmed.is_empty() {
-        return None;
-    }
-    if trimmed.len() > SOURCE_MAP_BYTE_CAP {
-        let mut cap = SOURCE_MAP_BYTE_CAP;
-        while cap > 0 && !trimmed.is_char_boundary(cap) {
-            cap -= 1;
-        }
-        crate::slog!(
-            "[agents] source-map.json truncated: {} bytes > {} byte cap; \
-             including first {} bytes",
-            trimmed.len(),
-            SOURCE_MAP_BYTE_CAP,
-            cap
-        );
-        Some(trimmed[..cap].to_string())
-    } else {
-        Some(trimmed.to_string())
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -310,10 +261,13 @@ mod tests {
         );
     }
 
-    // ── source-map.json tests ────────────────────────────────────────────────
+    // ── source-map.json must NOT be inlined into the bundle ──────────────────
+    // The file is kept on disk for the merge-time source-map-check gate, but
+    // inlining it into every agent spawn ballooned the orientation past 96 KB
+    // and drowned out the workflow rules in AGENT.md.
 
     #[test]
-    fn source_map_included_after_agent_md() {
+    fn source_map_not_included_even_when_present() {
         let tmp = tempfile::tempdir().unwrap();
         write_file(tmp.path(), ".huskies/AGENT.md", "agent content");
         write_file(
@@ -324,92 +278,12 @@ mod tests {
 
         let result = read_project_local_prompt(tmp.path()).unwrap();
         assert!(
-            result.contains("=== .huskies/source-map.json ==="),
+            !result.contains("=== .huskies/source-map.json ==="),
-            "source-map delimiter must be present: {result}"
+            "source-map must not appear as an orientation section: {result}"
         );
         assert!(
-            result.contains(r#""src/lib.rs""#),
+            !result.contains("src/lib.rs"),
-            "source-map content must be present: {result}"
+            "source-map content must not be inlined: {result}"
-        );
-        // source-map section must appear after AGENT.md section
-        let agent_pos = result.find("=== .huskies/AGENT.md ===").unwrap();
-        let sm_pos = result.find("=== .huskies/source-map.json ===").unwrap();
-        assert!(
-            sm_pos > agent_pos,
-            "source-map section must come after AGENT.md section"
-        );
-    }
-
-    #[test]
-    fn source_map_missing_skipped_silently() {
-        let tmp = tempfile::tempdir().unwrap();
-        write_file(tmp.path(), ".huskies/AGENT.md", "agent content");
-        // source-map.json intentionally absent
-
-        let result = read_project_local_prompt(tmp.path()).unwrap();
-        assert!(
-            !result.contains("source-map.json"),
-            "absent source-map must not create a section: {result}"
-        );
-    }
-
-    #[test]
-    fn source_map_empty_skipped_silently() {
-        let tmp = tempfile::tempdir().unwrap();
-        write_file(tmp.path(), ".huskies/AGENT.md", "agent content");
-        write_file(tmp.path(), ".huskies/source-map.json", "");
-
-        let result = read_project_local_prompt(tmp.path()).unwrap();
-        assert!(
-            !result.contains("source-map.json"),
-            "empty source-map must not create a section: {result}"
-        );
-    }
-
-    #[test]
-    fn source_map_only_returns_some() {
-        let tmp = tempfile::tempdir().unwrap();
-        // Only source-map.json present; all orientation files absent.
-        write_file(
-            tmp.path(),
-            ".huskies/source-map.json",
-            r#"{"src/main.rs": {}}"#,
-        );
-
-        let result = read_project_local_prompt(tmp.path());
-        assert!(
-            result.is_some(),
-            "source-map alone must produce Some bundle"
-        );
-        assert!(
-            result.unwrap().contains("=== .huskies/source-map.json ==="),
-            "bundle must contain source-map section"
-        );
-    }
-
-    #[test]
-    #[allow(clippy::string_slice)] // sm_start is derived from str::find — always a char boundary
-    fn source_map_truncated_at_byte_cap() {
-        let tmp = tempfile::tempdir().unwrap();
-        write_file(tmp.path(), ".huskies/AGENT.md", "agent");
-        // Build content larger than SOURCE_MAP_BYTE_CAP (200 KB).
-        let big = "x".repeat(SOURCE_MAP_BYTE_CAP + 1024);
-        write_file(tmp.path(), ".huskies/source-map.json", &big);
-
-        let result = read_project_local_prompt(tmp.path()).unwrap();
-        assert!(
-            result.contains("=== .huskies/source-map.json ==="),
-            "truncated source-map must still produce a section: {result}"
-        );
-        // The content length of just the source-map section must be <= SOURCE_MAP_BYTE_CAP.
-        let sm_start = result.find("=== .huskies/source-map.json ===").unwrap()
-            + "=== .huskies/source-map.json ===\n".len();
-        let sm_content = &result[sm_start..];
-        assert!(
-            sm_content.len() <= SOURCE_MAP_BYTE_CAP,
-            "source-map section content must be <= {} bytes, got {}",
-            SOURCE_MAP_BYTE_CAP,
-            sm_content.len()
         );
     }
 }