Add vulture as the Python analogue of the frontend's knip: a make target
(lint-deadcode), [tool.vulture] config, and a committed allowlist baseline
(.vulture_allowlist.py) that ratchets like the existing ruff/basedpyright
budgets. lint-deadcode-update regenerates the baseline.
Remove the unreachable statements vulture surfaced at 100% confidence:
duplicate returns, dead branches after unconditional returns, a redundant
trailing pass, and a dead post-call logging block in the sagemaker handler.
All are provably unreachable, so behavior is unchanged.
