Package maintenance: v1.0.0 bump and cleanup

[kdw503]

Summary

• Bump version to 1.0.0
• Change dev field from Int sentinel to Union{Nothing,Int}
• Rename workertid field to tid, add workertid accessor overload
• Annotate maxshift as NTuple{N,<:Integer}, add constructor validation test
• Use isnothing instead of == nothing for thresh check
• Add Manifest-v*.toml to .gitignore

Test plan

• All existing tests pass (Pkg.test())
• Constructor validation test added for maxshift annotation

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 65.93%. Comparing base (50979e7) to head (05e6d05).
⚠️ Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
src/RegisterWorkerAperturesMismatch.jl	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #33      +/-   ##
==========================================
+ Coverage   65.55%   65.93%   +0.37%     
==========================================
  Files           1        1              
  Lines          90       91       +1     
==========================================
+ Hits           59       60       +1     
  Misses         31       31              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.