The mesh's forge accounts all read every repository, and a build's fetch says the forge's own words

mesh-catalog #495 gave read on every repository to the tools' account alone. The build modules
fetch over ssh as nox-builder (the forge-account provider's builders account, ADR 0466 §3), so
ace's and g14's fetch of jschoubben/car-hunter and jschoubben/snake still failed; the machines'
agents (nox-agent, ADR 0410 §1) could not read them either.

- gitea: readall.ts grants every account of one list, meshAccounts in tools-account.ts (mesh-tools,
  nox-builder, nox-agent; a Go test holds the two Go names to internal/forgeaccount's constants),
  on the same start pass, forge events and tools. gitea_unreadable_repos answers per account and
  names the accounts the forge does not hold yet; gitea_grant_read takes accounts as well as
  repositories. An absent account is asked nothing; the start pass runs again ten minutes apart
  until every account was there once.
- mesh-build-go, mesh-build-node, mesh-build-image: pin mesh-sdk ff81bdf8 (fix/fetch-reads-all),
  whose forgekey.Said keeps git's words past the bare "error:" line: the mirror's line said only
  "git -C: error:". Their own git reasons (ls-files, ls-remote, rev-parse, repack) go through it too.

modules/mesh-build-node/cmd/mesh-build-node/fetch.go

@@ -212,7 +212,7 @@ func (m *Module) fetchInto(ctx context.Context, req buildstep.FetchRequest, grou
 func (m *Module) typeScriptModules(ctx context.Context, tree string) (dirs []string, packages map[string]bool, err error) {
 	r := m.Run(ctx, m.baseEnv(), "git", "-C", tree, "ls-files", "--", "module.json", "*/module.json")
 	if r.Status != 0 || r.Err != "" {
-		return nil, nil, fmt.Errorf("git ls-files: %s", firstLine(r.Err+" "+r.Stderr))
+		return nil, nil, fmt.Errorf("git ls-files: %s", forgekey.Said(r.Err+"\n"+r.Stderr))
 	}
 	packages = map[string]bool{}
 	for _, l := range strings.Split(r.Stdout, "\n") {