Introduce signals change (#655)

* adding support for signals

* reducing false positives for signals like positive interaction

* adding docs. Still need to fix the messages list, but waiting on PR #621

* Improve frustration detection: normalize contractions and refine punctuation

* Further refine test cases with longer messages

* minor doc changes

* fixing echo statement for build

* fixing the messages construction and using the trait for signals

* update signals docs

* fixed some minor doc changes

* added more tests and fixed docuemtnation. PR 100% ready

* made fixes based on PR comments

* Optimize latency

1. replace sliding window approach with trigram containment check
2. add code to pre-compute ngrams for patterns

* removed some debug statements to make tests easier to read

* PR comments to make ObservableStreamProcessor accept optonal Vec<Messagges>

* fixed PR comments

---------

Co-authored-by: Salman Paracha <salmanparacha@MacBook-Pro-342.local>
Co-authored-by: MeiyuZhong <mariazhong9612@gmail.com>
Co-authored-by: nehcgs <54548843+nehcgs@users.noreply.github.com>

cli/planoai/main.py

@@ -81,7 +81,7 @@ def main(ctx, version):
 
 @click.command()
 def build():
-    """Build Arch from source. Works from any directory within the repo."""
+    """Build Plano from source. Works from any directory within the repo."""
 
     # Find the repo root
     repo_root = find_repo_root()
@@ -112,7 +112,7 @@ def build():
             ],
             check=True,
         )
-        click.echo("archgw image built successfully.")
+        click.echo("plano image built successfully.")
     except subprocess.CalledProcessError as e:
         click.echo(f"Error building plano image: {e}")
         sys.exit(1)