feat: add configurable bootstrap truncation

docs/concepts/agent-workspace.md

@@ -109,8 +109,10 @@ See [Memory](/concepts/memory) for the workflow and automatic memory flush.
   - Canvas UI files for node displays (for example `canvas/index.html`).
 
 If any bootstrap file is missing, Clawdbot injects a "missing file" marker into
-the session and continues. `clawdbot setup` can recreate missing defaults
-without overwriting existing files.
+the session and continues. Large bootstrap files are truncated when injected;
+adjust the limit with `agents.defaults.bootstrapMaxChars` (default: 20000).
+`clawdbot setup` can recreate missing defaults without overwriting existing
+files.
 
 ## What is NOT in the workspace
 

docs/concepts/system-prompt.md

@@ -38,7 +38,9 @@ Bootstrap files are trimmed and appended under **Project Context** so the model
 - `HEARTBEAT.md`
 - `BOOTSTRAP.md` (only on brand-new workspaces)
 
-Large files are truncated with a marker. Missing files inject a short missing-file marker.
+Large files are truncated with a marker. The max per-file size is controlled by
+`agents.defaults.bootstrapMaxChars` (default: 20000). Missing files inject a
+short missing-file marker.
 
 ## Time handling