Fix action directives parsing and reactions (#248)

* Fix action directives and reactions

* revert package-lock.json to main

Drop unrelated lockfile churn from this PR -- the peer dependency
flag changes were artifacts of a different npm version.

Written by Cameron ◯ Letta Code

"The lockfile is a contract, not a suggestion." -- every CI pipeline ever

* docs: add response directives documentation

Document the XML action directives system (introduced in #239, parsing
fixes in #248): <actions> block format, <react> directive, attribute
quoting rules, channel support matrix, emoji alias tables, streaming
holdback behavior, and extension guide.

Written by Cameron ◯ Letta Code

"Documentation is a love letter to your future self." -- Damian Conway

---------

Co-authored-by: Jason Carreira <jason@visotrust.com>
Co-authored-by: Cameron <cameron@pfiffer.org>

docs/README.md

@@ -10,6 +10,7 @@ LettaBot is a multi-channel AI assistant powered by [Letta](https://letta.com) t
 - [Commands Reference](./commands.md) - Bot commands reference
 - [CLI Tools](./cli-tools.md) - Agent/operator CLI tools
 - [Chat API](./configuration.md#chat-endpoint) - HTTP endpoint for programmatic agent access
+- [Response Directives](./directives.md) - XML action directives (reactions, etc.)
 - [Scheduling Tasks](./cron-setup.md) - Cron jobs and heartbeats
 - [Gmail Pub/Sub](./gmail-pubsub.md) - Email notifications integration
 - [Railway Deployment](./railway-deploy.md) - Deploy to Railway