refactor: drop self-evident topics comments (#52)

Comment-only follow-up to #51 per owner feedback; no functional change, plan is a no-op.

Author: xnoto

gh-repositories.tf

@@ -13,12 +13,7 @@ resource "github_repository" "repositories" {
   delete_branch_on_merge      = true
   squash_merge_commit_title   = "PR_TITLE"
   squash_merge_commit_message = "PR_BODY"
-  # Topics are declared in main.tf (local.topics_by_repository) and managed
-  # for active repositories only (local.active_github_repositories);
-  # archived repositories are skipped and their existing GitHub topics stay
-  # unmanaged. A missing entry for an active repository fails the plan; use
-  # an explicit empty list for a repository that should carry no topics.
-  topics = contains(local.active_github_repositories, each.key) ? local.topics_by_repository[each.key] : null
+  topics                      = contains(local.active_github_repositories, each.key) ? local.topics_by_repository[each.key] : null
   lifecycle {
     ignore_changes = [
       description,

main.tf

@@ -31,14 +31,6 @@ locals {
   private_github_repositories = toset([
     "agent-knowledge"
   ])
-  # Topics are managed for active repositories only
-  # (local.active_github_repositories). Archived repositories are skipped
-  # entirely (see gh-repositories.tf) and their existing GitHub topics stay
-  # unmanaged, so they carry no entry here. The lookup for active
-  # repositories is direct, so adding an active repository without a topics
-  # entry fails the plan; a repository intentionally without topics declares
-  # an explicit empty list. Values audited against live GitHub repository
-  # topics on 2026-09-02.
   topics_by_repository = {
     ".github"                  = ["community-health", "github", "org-profile"]
     "agent-knowledge"          = ["agents", "documentation", "knowledge-base", "opencode"]