CB-618: correct the role-agent entry — one charter file, and agent files need name:

11-Features.md

@@ -2010,9 +2010,23 @@ its charter to a file. Files fix that for both backends and make the contract re
   an agent pinned to `openai/gpt-5.6-terra` run with `-m opencode/x-preview-f-free` reported
   `> pin · x-preview-f-free`. A `model:` here is silently overridden on every spawn. The model stays
   in `bridged.yaml`, which also keeps role and backend as the separate axes the role pools need.
-- **The reply charter is still injected, not filed.** "End every turn with `bridge_reply`" must reach
-  a member that has no repo checkout, so it keeps its inline delivery. Verified that `--agent` and
-  `--append-system-prompt` compose: both the agent body and the appended rule are in force.
+- **Both charters travel in one file, or Claude Code will not start** (CB-618). The CLI refuses the
+  two prompt flags together: `Error: Cannot use both --append-system-prompt and
+  --append-system-prompt-file. Please use only one.` The first cut of this feature put the role
+  charter on the file flag and left the reply charter inline, and every claude-code spawn with a role
+  charter died at launch — reported by bridged as `spawn_timeout`, which hides the cause completely.
+  So when a role charter is present, both go in the one file with the reply charter **last**: last is
+  where the reply rule must sit, because it is the rule that must survive. A member with no role
+  charter keeps the inline flag, which is also the only form that reaches a member with no repo
+  checkout.
+- **A `.claude/agents/` file needs `name:` in its frontmatter** (CB-618). With only `description:`
+  the file is skipped in silence and the launch fails with `--agent 'architect' not found. Available
+  agents: claude, Explore, ...`. The OpenCode files take their name from the filename and need no
+  such key, so the two formats are not interchangeable even though the bodies are identical.
+- **Measured together, on the real binary.** `claude --agent architect --append-system-prompt-file
+  <both charters>` answered `ROLEOK, REPLYOK, yes` — agent body, role charter and reply charter all
+  in force at once. Both defects above shipped green because every test read the argv bridged builds
+  and none ran the binary that has to accept it (see #113).
 
 ### Found while cataloguing, not by looking for bugs