v1.5.0: Inline subagent panels, Bedrock compaction fixes, context window debug view

New features:
- Inline subagent panels with expand/collapse and click-to-toggle
- /context slash command to inspect bedrock_message_history
- Child-to-parent question routing with auto-answer for subagents
- Subagent token usage and cost merging into parent conversation
- Randomized session-colored user avatar silhouettes

Bug fixes:
- Bedrock: remove orphaned tool_results after compaction
- Bedrock: self-healing exchange lookup for out-of-order streaming
- Bedrock: append continuation prompt when conversation ends with assistant
- Duration sanity check rejects epoch-time artifacts from session restore
- Cache hit rate calculation uses actual total_input_tokens
- Hide "Time to first token" when value is zero

Improvements:
- Demote verbose bedrock-debug logs to debug/trace levels
- Bedrock tool usage counting falls back to action counting
- Remove logout menu item from workspace menu

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/src/terminal/view/action.rs

@@ -422,6 +422,8 @@ pub enum TerminalAction {
     AwsCliNotInstalledBanner(AwsCliNotInstalledBannerAction),
     /// Toggle the usage footer on the last AI block in the active conversation.
     ToggleUsageFooter,
+    /// Toggle the context window debug view showing bedrock_message_history.
+    ToggleContextView,
     /// Reveal a hidden child agent pane from the orchestrator status card.
     RevealChildAgent {
         conversation_id: AIConversationId,
@@ -702,6 +704,7 @@ impl fmt::Debug for TerminalAction {
             AwsBedrockLoginBanner(action) => write!(f, "AwsBedrockLoginBanner({action:?})"),
             AwsCliNotInstalledBanner(action) => write!(f, "AwsCliNotInstalledBanner({action:?})"),
             ToggleUsageFooter => write!(f, "ToggleUsageFooter"),
+            ToggleContextView => write!(f, "ToggleContextView"),
             RevealChildAgent { .. } => write!(f, "RevealChildAgent"),
             ToggleSessionRecording => write!(f, "ToggleSessionRecording"),
             OpenCLIAgentRichInput => write!(f, "OpenCLIAgentRichInput"),