Add a new is_local info function

[bradhe]

Helps us write logic that's specific to local runs. Otherwise, adds some tests for the existing functions as I found a bug along the way in how we process some environment variables.

[coderabbitai]

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[Copilot]

Pull request overview

This PR adds a new runtime info helper to detect Tower CLI “local runs”, and hardens boolean env-var parsing by ensuring missing values default to "false" instead of raising.

Changes:

• Add info.is_local() backed by TOWER__RUNTIME__IS_LOCAL.
• Fix info.is_cloud_run() to default to "false" when TOWER__RUNTIME__IS_TOWER_MANAGED is missing.
• Add comprehensive pytest coverage for the tower.info env-var helpers, and set TOWER__RUNTIME__IS_LOCAL=true in the CLI local-run path.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
tests/tower/test_info.py	Adds new unit tests covering tower.info env-var accessors and boolean parsing.
src/tower/info/__init__.py	Implements is_local() and adjusts is_cloud_run() default behavior.
crates/tower-cmd/src/run.rs	Injects TOWER__RUNTIME__IS_LOCAL=true for CLI local execution.

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