perf: cache templates and pre-allocate maps and slices#223
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Description
Optimize hot paths by caching parsed templates in the changelog generator and pre-allocating maps/slices with known or estimated capacities across discovery, config, workspace, and plugin packages.
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Notes for Reviewers
changeloggenerator/generator.goavoids re-parsing the same contributor/new-contributor templates on every entrymake(map)andmake([]T)calls in hot loops now use capacity hints derived from input sizes