feat: add b-route send adapter shell

docs/superpowers/plans/2026-07-10-r6f-r14-continuous-execution-plan.md

@@ -296,7 +296,7 @@ git push gitea main
 - Produces: `func NewBRouteSendMessageConnector(config BRouteSendAdapterConfig) SendMessageConnector`.
 - In this round, accepted modes are `disabled` and `dry_run_contract`; any other mode returns `broute_mode_blocked`.
 
-- [ ] **Step 1: Write disabled-mode test**
+- [x] **Step 1: Write disabled-mode test**
 
 ```go
 func TestBRouteSendMessageConnectorDisabledMode(t *testing.T) {
@@ -309,15 +309,15 @@ func TestBRouteSendMessageConnectorDisabledMode(t *testing.T) {
 }
 ```
 
-- [ ] **Step 2: Write dry-run contract test**
+- [x] **Step 2: Write dry-run contract test**
 
 Add `TestBRouteSendMessageConnectorDryRunContract` asserting no external process starts and result contains `ConnectorMode="broute-dry-run-contract"` and `Accepted=false`.
 
-- [ ] **Step 3: Implement adapter shell**
+- [x] **Step 3: Implement adapter shell**
 
 Implement a connector that validates request fields and returns contract-shaped blocked/dry-run results only. Do not call `Start-Process`, do not load DLLs, do not click/type.
 
-- [ ] **Step 4: Verify and commit**
+- [x] **Step 4: Verify and commit**
 
 ```powershell
 git diff --check
@@ -332,6 +332,14 @@ git push gitea main
 
 **Acceptance gate:** B-route contract exists; no real send entrypoint is invoked.
 
+**R6i Result:**
+
+- Added `internal/tools/send_message_broute_adapter.go` with `BRouteSendAdapterConfig` and `NewBRouteSendMessageConnector`.
+- Added disabled-mode and dry-run-contract tests.
+- `disabled` returns `broute_mode_blocked`; `dry_run_contract` validates request shape and returns `broute_dry_run_only`.
+- The adapter shell does not start a sidecar, load DLLs, click/type UI, replay network traffic, or upload files.
+- Production `isphere_send_message` remains blocked in the default MCP runtime.
+
 ---
 
 ### R6j: Online sandbox-send recording package v2