spec(area-mountain-panorama): require jagged ridgeline, forbid Gaussian peaks (#5411)

## Summary

- Generated implementations modelled summits as smooth Gaussian bumps
(e.g. `matplotlib.py:60-62`), so the silhouette read like a row of bell
curves instead of an alpine panorama.
- Spell out in `specification.md` that the skyline must be
piecewise-linear / fractal: sharp triangular peaks, asymmetric flanks,
rugged saddles — and explicitly rule out Gaussian / bell-curve peak
modelling.
- Add an optional layered foreground/background ridge note for
photographic depth (Zermatt-style panorama).
- Tag spec with `jagged` in `specification.yaml`.

## Follow-up after merge

Re-trigger generation so all libraries pick up the new wording:

```bash
gh workflow run bulk-generate.yml -f specification_id=area-mountain-panorama -f library=all
```

## Test plan

- [ ] Maintainer reviews wording for clarity / library-agnostic phrasing
- [ ] After merge, regenerated implementations visually show jagged
triangular peaks, not Gaussian bumps

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: 3 people

plots/area-mountain-panorama/specification.md

@@ -2,7 +2,7 @@
 
 ## Description
 
-A panoramic mountain silhouette chart that renders the horizon as seen from a fixed vantage point, like a photograph of a ridgeline against the sky. A filled area under the skyline curve traces the ridgeline across a horizontal viewing range (in degrees of bearing or horizontal distance), and major summits are annotated with their name and elevation. Unlike an elevation-profile-along-a-trail, this plot is the angular view of the surrounding peaks from a single observer, making it ideal for summit-identification infographics, alpine panoramas, and travel guides.
+A panoramic mountain silhouette chart that renders the horizon as seen from a fixed vantage point, like a photograph of a ridgeline against the sky. A filled area under the skyline curve traces the ridgeline across a horizontal viewing range (in degrees of bearing or horizontal distance), and major summits are annotated with their name and elevation. The skyline is jagged and angular — sharp triangular peaks with steep, often asymmetric flanks meeting at pointed apexes, connected by rugged ridges with cols, sub-peaks and rocky notches — not a sequence of smooth bell-shaped bumps. Unlike an elevation-profile-along-a-trail, this plot is the angular view of the surrounding peaks from a single observer, making it ideal for summit-identification infographics, alpine panoramas, and travel guides.
 
 ## Applications
 
@@ -25,6 +25,9 @@ A panoramic mountain silhouette chart that renders the horizon as seen from a fi
 
 ## Notes
 
+- Render the ridgeline as a piecewise-linear / fractal silhouette: triangular peaks with sharp apexes and steep linear flanks, with small irregular jaggedness along the ridges (e.g. midpoint-displacement noise, jittered linear segments, or summed steep triangle/tent functions). Do NOT model summits as Gaussian / bell-curve bumps — the silhouette must read as alpine rock, not as a probability density
+- Vary slope steepness and asymmetry per summit (e.g. one flank steeper than the other), and let saddles between neighboring peaks dip far enough to make each summit individually recognizable
+- Optional layered depth: a darker foreground ridge in front of one or two lighter background ridges fading toward the sky color, like a classic Zermatt / Matterhorn panorama photograph
 - Fill the area below the ridgeline with a dark solid color (photo-like silhouette, evening/dusk feel)
 - Optional sky-gradient background above the ridgeline (light blue → white, or dusk orange → deep blue) for a photographic mood
 - Annotate each peak with a thin leader line from the summit up to a label; label format is peak name on top and elevation in meters below (e.g., "Matterhorn" / "4478 m")

plots/area-mountain-panorama/specification.yaml

@@ -6,7 +6,7 @@ title: Mountain Panorama Profile with Labeled Peaks
 
 # Specification tracking
 created: 2026-04-24T21:39:00Z
-updated: 2026-04-24T21:39:00Z
+updated: 2026-04-25T00:00:00Z
 issue: 5365
 suggested: MarkusNeusinger
 
@@ -27,4 +27,5 @@ tags:
   features:
     - annotated
     - silhouette
+    - jagged
     - geospatial