Add synoptic-morph: 30-day rolling morph timelapse

synopticMorph.sh: rolling-cache implementation. On each run:
1. Pick the last WINDOW_DAYS*4 charts from the archive.
2. For each adjacent pair, fill any missing pair-morph (cached at
   /mnt/enclave/synoptic/pairs/<chartA>__<chartB>/p_NNNN.png).
3. Evict pair dirs whose slug isn't in the current window.
4. Symlink frames into a temp seq dir with LINGER on each source
   chart and DWELL on the latest, fade-in 1s and fade-out 2s.
5. Encode to /srv/www/pestrel/morph.mp4 with ffmpeg/h264.

Bootstrap: ~50 min CPU on first run (119 pair morphs at ~25s each).
Steady state: ~1 min/cycle (1 new pair + concat + encode).

synoptic-morph.service: oneshot, TimeoutStartSec=2h to cover the
bootstrap, Nice=10 + IOSchedulingClass=idle so it doesn't fight
the system for CPU/disk.

synoptic.service gains OnSuccess=synoptic-morph.service so the
chain fires automatically after each successful chart fetch.

morph.html: points at /morph.mp4 now. index.html: "Three-day
history" button renamed to "Monthly history", URL /morph.html.

setup.sh: installs the new unit + script, provisions
/mnt/enclave/synoptic/{pairs,out} when the enclave mount is present.

.gitignore: drop .claude/ (transient harness state).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

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