Review build-jobsync-container, refine docs-preview tooling

- Review build-jobsync-container.md: fix nonexistent `mirror-sync` task
  reference (Forgejo mirrors sync automatically), mark reviewed
- Remove bat hint from docs-review checklist (output not visible in
  agent sessions), keep docs-preview hint as user-facing step
- Simplify review-documentation.md visual preview section
- Fix Python 3.14 tarfile deprecation warning in docs-preview

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/how-to/jobsync/build-jobsync-container.md

@@ -1,6 +1,7 @@
 ---
 title: Build JobSync Container
-modified: 2026-03-08
+modified: 2026-03-11
+last-reviewed: 2026-03-11
 tags:
   - how-to
   - jobsync
@@ -19,7 +20,7 @@ The derivation is at `containers/jobsync/default.nix`. It uses `buildNpmPackage`
 
 ## Upgrading JobSync
 
-1. Update the forge mirror: `mise run mirror-sync jobsync`
+1. Verify the forge mirror is current: check `https://forge.eblu.me/mirrors/jobsync` (mirrors sync automatically)
 2. Update `version` in `default.nix` to match the new upstream tag
 3. Clear `hash` in `fetchgit` (set to `""`), build, grab the correct hash from the error
 4. Clear `npmDepsHash` (set to `""`), build again, grab the correct hash

docs/how-to/knowledgebase/review-documentation.md

@@ -94,11 +94,7 @@ If changes are pending, investigate whether docs or infrastructure is stale.
 
 ## Visual Preview
 
-After reviewing and editing a card, visually verify the rendered output.
-
-**Quick scan (agent):** Have the agent display the card with `bat` for a terminal-based visual check.
-
-**Full rendered preview:** Build the entire Quartz docs site locally and open directly to the card:
+After reviewing and editing a card, visually verify the rendered output. This step is for the human reviewer — build the full Quartz docs site locally and open directly to the card:
 
 ```bash
 mise run docs-preview how-to/knowledgebase/review-documentation