Three findings from the CodeRabbit, code-quality and Cursor reviews.
The runtime loop tested truthiness while constants.py documented presence,
so a platform exporting a bare CI= fell through to the TTY fallback and
was mislabelled as an ordinary local run. Presence is now what it says.
The assistant markers keep truthiness deliberately: there an empty value
means the tool set a placeholder rather than claiming the session.
DYNO and WEBSITE_INSTANCE_ID marked Heroku dynos and Azure App Service
instances as serverless, and since serverless is checked first they could
never reach the container label. They move to a paas context, which is
what they are: long-lived containers rather than per-invocation
functions. AWS_EXECUTION_ENV is dropped entirely - it is set on ECS and
EC2 as well as Lambda, and AWS_LAMBDA_FUNCTION_NAME already covers Lambda
without the collision.
The container probe no longer wraps os.path.exists in a try/except.
os.path.exists handles OSError internally and returns False, so the
handler guarded a condition that cannot occur and only hid the intent.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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