diff --git a/CLAUDE.md b/CLAUDE.md
index 80e4758..104da61 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -251,24 +251,23 @@ venv/bin/python lib/tag_stats.py 5     # only tags with 5+ posts
 - Root SVG: `width="100%" height="100%"` with `viewBox` (never fixed pt/px)
 - RST embed: `:width: 100%` and `:align: center`
 
-### Animation Pattern (CSS only, no JS)
-```xml
-<defs>
-<style type="text/css">
-@keyframes fadeIn {
-  from { opacity: 0; }
-  to { opacity: 1; }
-}
-.anim { opacity: 0; animation: fadeIn 0.8s ease-out forwards; }
-.d0 { animation-delay: 0s; }
-.d1 { animation-delay: 3s; }
-/* ... increment by 2-3s per group */
-</style>
-</defs>
-```
+### Animation Pattern (click-to-play)
+
+SVGs render fully visible by default. A play button overlay triggers sequential fadeIn animation on click.
+
+**SVG markup:** No `<style>` block needed. Just wrap groups in `<g class="anim dN">` where N controls sequence order.
+
+**JS controller** (added once per page via `raw:: html`):
+- Finds all SVGs with `.anim` elements, wraps each in a container, adds play button
+- On click: hides all `.anim` groups (opacity 0), then animates them in sequence using `@keyframes svgFadeIn` with calculated delays based on `dN` class values
+- Total animation spread scales to ~15s regardless of group count (`step = 15 / (maxD + 1)`)
+- After animation completes, restores full opacity & shows play button again
+
+**Previous approach (scroll-driven CSS view-timeline) was removed** because browser support proved unreliable. See royal-we post for the working click-to-play implementation.
+
 - Wrap each conceptual group in `<g class="anim dN">`
-- Groups fade in sequentially (3s apart for major concepts, 1-2s for chain elements)
-- Keep total animation under 30s
+- N values control sequence order (d0 appears first, d1 second, etc.)
+- Multiple groups can share the same dN class to appear simultaneously
 
 ### Graphviz Dot Conventions
 ```dot
@@ -281,8 +280,9 @@ edge [color="#AAAAAA" arrowsize=0.6 fontcolor="#AAAAAA"]
 1. Strip `<title>` tags: `sed -i 's/<title>[^<]*<\/title>//g'` (prevents tooltip artifacts)
 2. Replace fixed dimensions: `width="100%" height="100%"` keeping viewBox
 3. Change cluster label fontcolor from `#aaaaaa` to `#cccccc`
-4. Wrap groups with animation classes
-5. Verify: no `fill="black"`, no `stroke="black"`, no `fill="#333333"`
+4. Wrap groups with animation classes (`<g class="anim dN">`)
+5. Remove `<defs><style>...</style></defs>` block (animation handled by page-level JS)
+6. Verify: no `fill="black"`, no `stroke="black"`, no `fill="#333333"`
 
 ## RUSSELL'S PROJECT TECH STACKS
 
@@ -307,6 +307,24 @@ edge [color="#AAAAAA" arrowsize=0.6 fontcolor="#AAAAAA"]
 - make_post_sell & remarkbox are **Python/Pyramid**, NOT Django
 - uncloseai.com is **Node.js**, NOT Python
 
+## BUILD SERVER (build.unturf.com)
+
+**CI/CD for this blog & all unturf projects.** GitLab Runner with shell executor.
+
+**Config management:** Salt states in `~/git/foxhop-states/`
+- `gitlab/build-host/ubuntu.sls` — runner config, cleanup cron, build deps
+- `lxd/build-host.sls` — LXD + ZFS, image cache expiry
+- `top.sls` targets `build.unturf.com` with both states
+
+**Key settings (salt-managed):**
+- `concurrent = 4` in `/etc/gitlab-runner/config.toml` (pillar: `gitlab-runner:concurrent`)
+- LXD `images.remote_cache_expiry = 3` days, `images.auto_update_interval = 0`
+- `/etc/cron.d/build-cleanup` — hourly container + zombie cleanup, weekly image prune, disk alerts at 85%
+
+**Postmortem:** `russell.ballestrini.net/build-server-postmortem-disk-full/` (2026-03-08)
+
+**Pipeline for this repo:** `make venv && make html && make formats && make resume` → tar → deploy via `deploy-www.sh`
+
 ## DATE HANDLING FOR NEW CONTENT
 
 **CRITICAL: ALWAYS check the current date BEFORE creating ANY new documents**
diff --git a/content/2026-03-08-build-server-postmortem-disk-full.rst b/content/2026-03-08-build-server-postmortem-disk-full.rst
index cfe005a..8709744 100644
--- a/content/2026-03-08-build-server-postmortem-disk-full.rst
+++ b/content/2026-03-08-build-server-postmortem-disk-full.rst
@@ -41,7 +41,7 @@ Five independent failures conspired. Each alone stays survivable. Together they
 
 ``/etc/gitlab-runner/config.toml`` set ``concurrent = 64``. A shell executor creates a full git checkout per slot per project. 64 slots across multiple repos meant 64 copies of every codebase. The ``unsandbox-all-upgradable`` repo alone stored 3.7G FreeBSD & 710M OpenBSD qcow2 images per slot. Slot 15 alone consumed 4.3G.
 
-**Fix applied:** ``concurrent = 4``. Matches actual workload. Stale slots 4-63 removed.
+**Fix applied:** ``concurrent = 4``. Matches actual workload. Stale slots 4-63 removed. Enforced permanently via salt state ``gitlab.build-host.ubuntu`` (pillar-configurable: ``gitlab-runner:concurrent``).
 
 2. LXD images never expired
 -----------------------------
@@ -50,7 +50,7 @@ CI pipelines launch LXD containers for multi-distro testing (Alpine, Arch, Debia
 
 ``images.remote_cache_expiry`` defaulted to 10 days but never cleaned up because ``images.auto_update_interval`` kept refreshing them. No pruning mechanism existed.
 
-**Fix applied:** ``images.remote_cache_expiry = 3``, ``images.auto_update_interval = 0``. Weekly cron prunes unused images.
+**Fix applied:** ``images.remote_cache_expiry = 3``, ``images.auto_update_interval = 0``. Weekly cron prunes unused images. Enforced permanently via salt state ``lxd.build-host``.
 
 3. orphaned LXD containers
 ---------------------------
@@ -104,6 +104,34 @@ Installed at ``/etc/cron.d/build-cleanup``:
 
 |
 
+salt states (permanent fixes)
+==============================
+
+Manual hotfixes on a server vanish on reprovision. Every fix got codified into salt states in ``foxhop-states`` so a ``salt-call state.highstate`` reproduces them.
+
+``gitlab/build-host/ubuntu.sls``:
+
+- Enforces ``concurrent`` in ``config.toml`` via sed (default 4, configurable via pillar ``gitlab-runner:concurrent``)
+- Manages ``/etc/cron.d/build-cleanup`` with all five cleanup jobs
+- Uses ``/snap/bin/lxc`` full paths (snap-installed LXD)
+- Disk alerts go to syslog via ``logger -t disk-alert`` instead of a file
+
+``lxd/build-host.sls``:
+
+- Sets ``images.remote_cache_expiry = 3`` (days)
+- Sets ``images.auto_update_interval = 0`` (CI pulls fresh images on demand)
+- Both idempotent with ``unless`` guards
+
+``top.sls`` already targets ``build.unturf.com`` with both states:
+
+.. code-block:: yaml
+
+    'build.unturf.com':
+      - gitlab.build-host.ubuntu
+      - lxd.build-host
+
+|
+
 disk recovery
 ==============
 
@@ -132,3 +160,5 @@ lessons
 **absence of signal stays a signal.** No disk alert fired because no disk alert existed. Silence in monitoring always means one of two things: everything works, or nothing watches. Assume the second until proven otherwise.
 
 **build servers need janitors.** CI systems produce waste: cached images, stopped containers, orphaned processes, stale checkouts. Without automated cleanup, waste accumulates until something breaks. The cron job costs nothing. The outage costs a pipeline.
+
+**manual fixes rot. salt states persist.** Every fix applied manually on the build server got codified into salt states within the same session. ``gitlab/build-host/ubuntu.sls`` manages concurrent limits & the cleanup cron. ``lxd/build-host.sls`` manages image cache expiry. A highstate reproduces the fix. A reprovision preserves it. Manual hotfixes buy time. Configuration management buys permanence.