feat: inject global rules into AI system prompt and fix Rules UI seeding

- Load global rules (AIFact/AIMemory) from local CloudModel and inject
  them into the Bedrock/OpenAI system prompt as a '## Global Rules' section
  when memory is enabled.
- Fix rule seeding: always re-seed predefined rules when the CloudModel has
  none, regardless of the has_seeded_predefined_rules flag (handles case
  where flag was set but rules never persisted due to prior missing owner).
- Rename /context slash command to /copy-context: dumps the full context
  window (global rules, progressive summary, message history) to the
  clipboard for debugging.

app/src/ai/agent/api/impl.rs

@@ -150,6 +150,7 @@ pub async fn generate_multi_agent_output(
                 tool_result_archive: params.bedrock_tool_result_archive.clone(),
                 progressive_summary: params.bedrock_progressive_summary.clone(),
                 messages_sent: params.bedrock_messages_sent.clone(),
+                global_rules: params.global_rules.clone(),
             };
 
             match openai_translator::execute(translator_request, &mut request).await {
@@ -178,6 +179,7 @@ pub async fn generate_multi_agent_output(
                 bedrock_tool_result_archive: params.bedrock_tool_result_archive.clone(),
                 bedrock_progressive_summary: params.bedrock_progressive_summary.clone(),
                 bedrock_messages_sent: params.bedrock_messages_sent.clone(),
+                global_rules: params.global_rules.clone(),
             };
 
             match crate::ai::bedrock::translator::execute(translator_request, &mut request).await {