Update CLI chat session bridge (#697)

* feat: add CLI chat sessions with Python agent bridge

Introduce a new CLI chat mode that connects Web UI directly to Hermes
Agent's AIAgent via a Python bridge subprocess and Socket.IO, bypassing
the API Server /v1/responses path. Supports streaming, slash commands
(/new, /undo, /retry, /branch, /compress, /save, /title), interrupt,
and steer.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

* feat: update CLI chat session bridge

* fix: extend agent bridge startup timeouts

* docs: update bridge chat session design

* feat: align bridge compression and provider registry

* chore: bump version to 0.5.20

---------

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

.gitignore

@@ -10,6 +10,8 @@ package-lock.json
 node_modules
 dist
 dist-ssr
+__pycache__/
+*.py[cod]
 server/dist
 packages/server/dist
 *.local
@@ -37,4 +39,4 @@ hermes-dependencies.md
 .superpowers/
 CLAUDE.md
 # Client source map artifacts
-packages/client/src/**/*.js
+packages/client/src/**/*.js