Converge learnings wording to canonical + carry upstream-drift paragraph

.github/copilot-instructions.md

@@ -152,3 +152,5 @@ After the final push, sweep-resolve stale older threads for removed code paths.
 ## When in Doubt
 
 Read [AGENTS.md](../AGENTS.md) for this repo's conventions and [../ARCHITECTURE.md](../ARCHITECTURE.md) for PlexCleaner's architecture, processing pipeline, and design patterns. For code-style rules, [`CODESTYLE.md`](../CODESTYLE.md) is authoritative. Don't restate any of these files' rules in commit bodies or PR descriptions - keep those focused on the change itself.
+
+**In a derived repo:** if you find a discrepancy that should be fixed in the template itself (this file or AGENTS.md is out of date, a rule is missing, something bit this repo and would bite the next), open an issue upstream in [`ptr727/ProjectTemplate`](https://github.com/ptr727/ProjectTemplate) rather than only fixing it locally - see the template's [AGENTS.md "Staying in Sync and Reporting Drift Upstream"](https://github.com/ptr727/ProjectTemplate/blob/main/AGENTS.md#staying-in-sync-and-reporting-drift-upstream).

AGENTS.md

@@ -30,8 +30,8 @@ This file is the canonical reference for cross-cutting AI-agent rules. The CI/CD
 - **Maintainer-pushed commits on a bot PR auto-disable auto-merge.** The merge-bot's `merge-dependabot` job only fires on `opened` / `reopened` events (auto-merge is enabled exactly once per PR, for Dependabot-authored PRs that originate from this repository, not forks). When a maintainer pushes commits to the bot's branch (a `synchronize` event with a non-bot actor), the `disable-auto-merge-on-maintainer-push` job fires and calls `gh pr merge --disable-auto`; the maintainer's commits stay in the PR but won't auto-merge with the bot's content. Re-enable manually (`gh pr merge --auto <PR>`) when ready. The merge-bot is on `pull_request_target` with per-PR concurrency; it carries only `merge-dependabot` + `disable-auto-merge-on-maintainer-push`.
 - **App-token workflows use Client ID, not App ID.** `actions/create-github-app-token` deprecated the numeric `app-id` input in v3.0.0; the merge-bot uses `client-id: ${{ secrets.CODEGEN_APP_CLIENT_ID }}` (with `private-key: ${{ secrets.CODEGEN_APP_PRIVATE_KEY }}`). The App token - not `GITHUB_TOKEN` - is required so the merge push is committed by the App and fires downstream workflows (`GITHUB_TOKEN` pushes are blocked from triggering further runs by GitHub's recursion guard). When adding new App-token call sites, use the same form - do not reintroduce `app-id`.
 - **Why parallel dual-target rather than develop-only with eventual flow-through:** consumers pull the Docker image and the release executables from `main` directly. A develop-only model would leave `main` running stale code during long-running develop features, so both branches receive their own bot updates on their own cadence and each stays current.
-- **Mirror to `develop` any change that lands on `main` outside the feature -> develop -> main flow.** A reconciliation-branch fix made to resolve a `develop -> main` promotion conflict, or a security PR that merges only to `main`, leaves `develop` behind on that content - and forward-only `develop` never back-merges to catch up (the same parallel-target principle as the bots). Before basing new work on `develop`, or diagnosing a defect from it, check for main-only content with `git log origin/develop..origin/main` (main commits not on develop) or `git diff origin/develop...origin/main` (their content): a non-empty result means develop is stale and the defect may already be fixed on `main`. A plain two-dot `git diff origin/develop origin/main` will not do - develop is normally ahead of main, so that diff is almost always non-empty regardless of staleness.
-- **Put issue-closing keywords (`Closes #N`) in the `develop -> main` promotion PR, not the feature or develop PR.** GitHub auto-closes an issue only from the PR (or commit) that merges to the default branch (`main`); a `Closes #N` that merges only to `develop` does not fire on promotion and leaves the issue open. Tag the promotion PR's description, or close the issue manually once the fix reaches `main`.
+- **Mirror to `develop` any change that lands on `main` outside the feature -> develop -> main flow.** "Mirror" means landing the same fix directly on `develop` via a follow-up PR targeting `develop` - never a `main -> develop` back-merge, which the forward-only rule forbids. A reconciliation-branch fix made to resolve a `develop -> main` promotion conflict, or a security PR that merges only to `main`, leaves `develop` behind on that content - and forward-only `develop` never back-merges to catch up (the same parallel-target principle as the bots). Before basing new work on `develop`, or diagnosing a defect from it, compare content and not commit history: run `git diff origin/main origin/develop` and inspect its `-` lines - the `main`-side of each difference, to check for staleness. A `-`/`+` pair within one hunk is usually just `develop` modifying that code as normal unpromoted work (occasionally `develop` is reworking a `main`-side fix differently - worth a glance). The stronger staleness signal is a deletion-only hunk (`-` lines, no `+` lines): content on `main` that `develop` lacks entirely, i.e. a `main`-only fix `develop` never received, so the defect may already be fixed on `main`. Prefer this over a commit-log check like `git log origin/develop..origin/main`, which is noisy here because it also lists routine promotion merges and the `main`-direct bot commits whose content `develop` already carries via its own parallel bot PRs.
+- **Put issue-closing keywords (`Closes #N`) where they fire on merge to the default branch (`main`).** GitHub closes an issue from a *PR description* only when that PR merges to `main`, so a `Closes #N` in a PR that targets `develop` never fires - put it in the `develop -> main` promotion PR instead. A closing keyword in a *commit message* does close the issue once that commit reaches `main` via promotion, but that is fragile across squash-merges, so prefer the promotion PR's description or close the issue manually once the fix lands on `main`.
 
 ## Release Model