feat: Add Microsoft Teams Bot Framework integration

Add complete Microsoft Teams platform integration with:

Platform Adapter (crates/aof-triggers/src/platforms/teams.rs):
- Bot Framework activity parsing (message, invoke)
- Adaptive Card response formatting
- JWT Bearer token authentication
- Tenant and channel restrictions
- Action.Submit handling for button clicks
- @mention removal from messages
- 10 unit tests covering all functionality

Documentation:
- docs/concepts/teams-integration.md - Overview with architecture
- docs/reference/teams-integration.md - Full API reference
- docs/guides/quickstart-teams.md - 15-minute setup guide
- docs/tutorials/teams-ops-bot.md - Complete ops bot tutorial

Examples:
- examples/triggers/teams-starter.yaml - Minimal config
- examples/triggers/teams-enterprise.yaml - Production config
- examples/agents/teams-ops.yaml - Teams-optimized agent

Registry Integration:
- Added TeamsConfig to TypedPlatformConfig enum
- Registered in PlatformRegistry::register_defaults()
- Added Teams capabilities (threading, interactive, approvals)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: initcron

crates/aof-triggers/src/platforms/mod.rs

@@ -201,6 +201,7 @@ pub mod slack;
 pub mod discord;
 pub mod telegram;
 pub mod whatsapp;
+pub mod teams;
 pub mod github;
 pub mod gitlab;
 pub mod bitbucket;
@@ -211,6 +212,7 @@ pub use slack::{SlackConfig, SlackPlatform};
 pub use discord::{DiscordConfig, DiscordPlatform};
 pub use telegram::{TelegramConfig, TelegramPlatform};
 pub use whatsapp::{WhatsAppConfig, WhatsAppPlatform};
+pub use teams::{TeamsConfig, TeamsPlatform};
 pub use github::{GitHubConfig, GitHubPlatform};
 pub use gitlab::{GitLabConfig, GitLabPlatform};
 pub use bitbucket::{BitbucketConfig, BitbucketPlatform};
@@ -252,6 +254,7 @@ pub enum TypedPlatformConfig {
     Discord(DiscordConfig),
     Telegram(TelegramConfig),
     WhatsApp(WhatsAppConfig),
+    Teams(TeamsConfig),
     GitHub(GitHubConfig),
     GitLab(GitLabConfig),
     Bitbucket(BitbucketConfig),
@@ -368,6 +371,13 @@ impl PlatformRegistry {
                 .map_err(|e| PlatformError::ParseError(format!("Invalid Jira config: {}", e)))?;
             Ok(Box::new(JiraPlatform::new(cfg)?))
         }));
+
+        // Teams
+        self.register("teams", Box::new(|config| {
+            let cfg: TeamsConfig = serde_json::from_value(config)
+                .map_err(|e| PlatformError::ParseError(format!("Invalid Teams config: {}", e)))?;
+            Ok(Box::new(TeamsPlatform::new(cfg)?))
+        }));
     }
 
     /// Register a new platform factory
@@ -515,6 +525,14 @@ pub fn get_platform_capabilities(platform: &str) -> PlatformCapabilities {
             rich_text: true, // Jira text format
             approvals: true, // issue workflows
         },
+        "teams" => PlatformCapabilities {
+            threading: true, // reply chains
+            interactive: true, // Adaptive Cards
+            files: true, // attachments
+            reactions: true, // message reactions
+            rich_text: true, // markdown
+            approvals: true, // Adaptive Card actions
+        },
         _ => PlatformCapabilities::default(),
     }
 }