Extract the verbatim-duplicated helpers into shared homes:
- buildEnv -> plugin.BuildWorkloadEnv (base plugin pkg; a sourceName param
preserves each plugin's slog prefix / log-scraper text)
- idShort -> plugin.IDShort
- commitStatusReporter -> staticsite.CommitStatusReporter, re-parameterized
on primitives (owner/repo/sha/targetURL/enabled) so staticsite needs no
dependency on the plugin package; reporter tests ported to staticsite
(plus a new nil-provider case)
containerNameFor/imageTagFor are intentionally left per-plugin: their
prefixes differ (dw-site- vs tf-build-) and name real Docker resources,
so merging them would risk mis-routing. Behavior-preserving; the
static/dockerfile test suites pass unchanged.
Reviewed: go APPROVE (0 CRITICAL/HIGH).
alexei.dolgolyov
bd7a11d4e7