Move versioning from Rails initializer to .sure-version file (#1587)

* Extract version to .sure-version file and add Sentry release tracking

Move the hardcoded version string to a `.sure-version` file at the repo
root so it can be read by both the Rails version initializer and other
tooling. Configure `config.release` in the Sentry initializer to tag
errors with the app version.

https://claude.ai/code/session_01KfUgF42B3exoU2vpErqJyW

* Use .sure-version as single source of truth in Helm CI workflows

Update chart-ci, chart-release, and publish workflows to read the app
version from .sure-version instead of regex-parsing version.rb. The
pre-release bump job now writes directly to .sure-version and stages it
for commit.

https://claude.ai/code/session_01KfUgF42B3exoU2vpErqJyW

* Guard empty .sure-version fallback

* fix: sync Helm chart version with .sure-version

* Moving on to `v0.7.1-alpha.*` with this

* Defensive rescue

* Getting fancy with versions now

---------

Signed-off-by: Juan José Mata <juanjo.mata@gmail.com>
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: SureBot <sure-bot@we-promise.com>
Co-authored-by: sure-admin <sure-admin@splashblot.com>

config/initializers/version.rb

@@ -16,7 +16,10 @@ module Sure
 
     private
       def semver
-        "0.7.0-alpha.8"
+        stripped_content = Rails.root.join(".sure-version").read.strip
+        stripped_content.presence || "n/a: #{commit_sha}"
+      rescue Errno::ENOENT
+        "n/a: #{commit_sha || 'unknown'}"
       end
   end
 end