vault: avoid shell=True in subprocess calls

[ideaship]

Summary

• Replace shell=True string interpolation with list form in View.take_action
  and Decrypt.take_action — a user-supplied path containing shell metacharacters
  (e.g. ;) could cause arbitrary command execution
• Propagate the ansible-vault exit code from Decrypt.take_action, which
  previously discarded it while View.take_action already returned it
• Guard both View and Decrypt against a missing path argument: nargs="?"
  makes the argument optional, but the code called os.path.isabs(None) and
  raised an unhelpful TypeError when it was omitted

Test plan

• pipenv run pytest tests/unit/commands/test_vault.py — all 11 tests pass
• pipenv run pytest — full suite clean

🤖 Generated with Claude Code

[sourcery-ai]

Hey - I've found 1 issue, and left some high level feedback:

• In View.take_action, the subprocess.call invocation now passes path directly instead of str(path), which will cause a mismatch with the updated tests (and may pass a Path object to subprocess); convert path to str(path) before including it in the argument list for consistency and correctness.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- In `View.take_action`, the `subprocess.call` invocation now passes `path` directly instead of `str(path)`, which will cause a mismatch with the updated tests (and may pass a `Path` object to `subprocess`); convert `path` to `str(path)` before including it in the argument list for consistency and correctness.

## Individual Comments

### Comment 1
<location path="osism/commands/vault.py" line_range="107" />
<code_context>
         if not os.path.isabs(path):
             path = os.path.join("/opt/configuration", path)
-        subprocess.call(f"/usr/local/bin/ansible-vault decrypt {path}", shell=True)
+        subprocess.call(["/usr/local/bin/ansible-vault", "decrypt", path])


</code_context>
<issue_to_address>
**issue (bug_risk):** Align decrypt behavior with view by returning or handling the subprocess exit code.

Right now `decrypt` ignores the return value from `subprocess.call`, so the CLI can report success even if `ansible-vault decrypt` fails. Please propagate the exit code (e.g., return it from `take_action`) or raise on failure (e.g., `subprocess.run([...], check=True)`) so errors are visible to callers.
</issue_to_address>

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