Improve error message when failing to send task to worker

[juliusgeo]

Description

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• Documentation change (pure documentation change)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactor (non-breaking changes to code which doesn't change any behaviour)
• CI (any automation pipeline changes)
• Chore (changes which are not directly related to any business logic)
• Test changes (add, refactor, improve or change a test)
• This change requires a documentation update

What's Changed

• Add a list of tasks or features here...

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Project	Deployment	Actions	Updated (UTC)
hatchet-docs	Ready	Preview, Comment	Mar 20, 2026 3:18pm

[github-actions]

Benchmark results

goos: linux
goarch: amd64
pkg: github.com/hatchet-dev/hatchet/internal/services/dispatcher
cpu: AMD Ryzen 9 7950X3D 16-Core Processor          
                  │ /tmp/old.txt │         /tmp/new.txt          │
                  │    sec/op    │    sec/op     vs base         │
LockAcquisition-8   699.6n ± 75%   700.8n ± 82%  ~ (p=0.818 n=6)

                  │ /tmp/old.txt │         /tmp/new.txt          │
                  │     B/op     │     B/op      vs base         │
LockAcquisition-8   324.0 ± 182%   350.5 ± 154%  ~ (p=0.457 n=6)

                  │ /tmp/old.txt │         /tmp/new.txt         │
                  │  allocs/op   │  allocs/op   vs base         │
LockAcquisition-8    4.000 ± 50%   4.000 ± 50%  ~ (p=1.000 n=6)

_{Compared against main (3e478b6)}

[promptless-for-oss]

📝 Documentation updates detected!

Updated existing suggestion: Update flow control env var from backlog size to lock acquisition timeout

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