Add path filters to CI and Docker workflows

Skip unnecessary workflow runs when only non-code files change (README,
docs, etc). Docker workflow always runs on version tags.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -3,6 +3,13 @@ name: CI
 on:
   pull_request:
     branches: [main]
+    paths:
+      - "src/**"
+      - "tests/**"
+      - "alembic/**"
+      - "pyproject.toml"
+      - ".pre-commit-config.yaml"
+      - ".github/workflows/ci.yml"
 
 jobs:
   lint:

.github/workflows/docker.yml

@@ -3,6 +3,14 @@ name: Docker
 on:
   push:
     branches: [main]
+    paths:
+      - "src/**"
+      - "alembic/**"
+      - "alembic.ini"
+      - "pyproject.toml"
+      - "Dockerfile"
+      - "docker-compose.yml"
+      - ".github/workflows/docker.yml"
     tags:
       - "v*"