refactor: use duty config change dedupe

[adityathebe]

Config change dedupe has moved to duty so the fingerprint cache and dedupe behavior can be shared.

Delegate cache initialization and dedupe decisions to duty, while keeping a temporary compatibility shim for config-db's local ConfigChange model.

Depends on flanksource/duty#1971.

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[github-actions]

Benchstat

Base: fcb78acd9715c197245d0465790575bac055ff7d
Head: ecac686af15357fec889b77a9e1d6b503499e1f8

📊 2 minor regression(s) (all within 5% threshold)

Benchmark	Base	Head	Change	p-value
BenchSaveResultsUpdateChanged/N=1000-4	75.30Mi	75.67Mi	+0.49%	0.004
BenchSaveResultsUpdateChanged/N=1000-4	914.0k	915.0k	+0.11%	0.041

✅ 1 improvement(s)

Benchmark	Base	Head	Change	p-value
BenchSaveResultsUpdateUnchanged/N=1000-4	130.0k	130.0k	-0.01%	0.006

Full benchstat output

goos: linux
goarch: amd64
pkg: github.com/flanksource/config-db/bench
cpu: AMD EPYC 9V74 80-Core Processor                
                                         │ bench-base.txt │           bench-head.txt           │
                                         │     sec/op     │    sec/op     vs base              │
BenchSaveResultsSeed/N=1000-4                959.6m ± 44%   956.0m ± 45%       ~ (p=0.937 n=6)
BenchSaveResultsUpdateUnchanged/N=1000-4     101.8m ± 10%   101.6m ±  8%       ~ (p=0.818 n=6)
BenchSaveResultsUpdateChanged/N=1000-4        1.039 ±  1%    1.036 ±  4%       ~ (p=1.000 n=6)
geomean                                      466.4m         465.2m        -0.27%

                                       │ bench-base.txt │           bench-head.txt           │
                                       │      MB/s      │    MB/s     vs base                │
BenchSaveResultsSeed/N=1000-4              0.000 ± 0%     0.000 ± 0%       ~ (p=1.000 n=6) ¹
BenchSaveResultsUpdateChanged/N=1000-4     0.000 ± 0%     0.000 ± 0%       ~ (p=1.000 n=6) ¹
geomean                                               ²               +0.00%               ²
¹ all samples are equal
² summaries must be >0 to compute geomean

                                         │ bench-base.txt │           bench-head.txt           │
                                         │      B/op      │     B/op      vs base              │
BenchSaveResultsSeed/N=1000-4                36.34Mi ± 0%   36.33Mi ± 0%       ~ (p=0.818 n=6)
BenchSaveResultsUpdateUnchanged/N=1000-4     11.52Mi ± 2%   11.52Mi ± 3%       ~ (p=0.589 n=6)
BenchSaveResultsUpdateChanged/N=1000-4       75.30Mi ± 0%   75.67Mi ± 0%  +0.49% (p=0.004 n=6)
geomean                                      31.59Mi        31.63Mi       +0.13%

                                         │ bench-base.txt │          bench-head.txt           │
                                         │   allocs/op    │  allocs/op   vs base              │
BenchSaveResultsSeed/N=1000-4                 442.4k ± 0%   442.4k ± 0%       ~ (p=0.584 n=6)
BenchSaveResultsUpdateUnchanged/N=1000-4      130.0k ± 2%   130.0k ± 4%  -0.01% (p=0.006 n=6)
BenchSaveResultsUpdateChanged/N=1000-4        914.0k ± 1%   915.0k ± 1%  +0.11% (p=0.041 n=6)
geomean                                       374.6k        374.8k       +0.03%

                                         │ bench-base.txt │         bench-head.txt          │
                                         │      B/s       │     B/s       vs base           │
BenchSaveResultsUpdateUnchanged/N=1000-4     9.766Ki ± 0%   9.766Ki ± 0%  ~ (p=1.000 n=6) ¹
¹ all samples are equal

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	golang/​github.com/​flanksource/​duty@​v1.0.1307 ⏵ v1.0.1308-0.20260515121513-ab373e44de48	+1

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