fix: update typer version constraint to >=0.19 for Literal type support

[Copilot]

Summary

Typer added typing.Literal support in 0.19.0. The previous constraint (>=0.12) allowed installations that would raise RuntimeError: Type not yet supported: typing.Literal['local', 'ray'] when invoking CLI commands like plugboard process run.

Changes

• Bumped the typer lower-bound in pyproject.toml from >=0.12 to >=0.19

[github-actions]

Benchmark comparison for 20fda4b1 (base) vs a94d06fc (PR)

------------------------------------------------------------------------------------------------------------------ benchmark: 2 tests -----------------------------------------------------------------------------------------------------------------
Name (time in ms)                                                                         Min                 Max                Mean            StdDev              Median               IQR            Outliers     OPS            Rounds  Iterations
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
test_benchmark_process_run (pr/.benchmarks/Linux-CPython-3.14-64bit/0001_pr)         530.7088 (1.0)      543.0744 (1.0)      535.8005 (1.0)      4.5996 (1.0)      535.4276 (1.0)      5.2162 (1.0)           2;0  1.8664 (1.0)           5           1
test_benchmark_process_run (main/.benchmarks/Linux-CPython-3.14-64bit/0001_base)     544.4225 (1.03)     562.3965 (1.04)     550.0654 (1.03)     7.2991 (1.59)     548.7844 (1.02)     8.3095 (1.59)          1;0  1.8180 (0.97)          5           1
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Legend:
  Outliers: 1 Standard Deviation from Mean; 1.5 IQR (InterQuartile Range) from 1st Quartile and 3rd Quartile.
  OPS: Operations Per Second, computed as 1 / Mean

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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