Add emacs-svg-maps skill (migrated from ~/.claude/skills/)

Consolidated all skills into this repo as the single source of truth.
Previously lived as an orphan in ~/.claude/skills/emacs-svg-maps/.

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

skills/emacs-svg-maps/SKILL.md

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+---
+name: emacs-svg-maps
+description: Emacs workflows for SVG map editing — nxml-mode, EWW preview, Inkscape integration, and emacsclient commands for itinerary map projects.
+---
+
+# Emacs SVG Map Editing
+
+## Quick Emacs Commands for SVG Work
+
+### Open SVG for source editing (nxml-mode)
+```bash
+emacsclient --socket-name=water --eval '(find-file "netherlands3.svg")'
+```
+
+### Quick preview in EWW (limited but fast)
+```bash
+emacsclient --socket-name=water --eval '(eww-open-file (expand-file-name "netherlands3.svg"))'
+```
+Tell Fénix to press `g` in EWW to reload after changes.
+
+### Navigate to MARKERS layer in SVG source
+```bash
+emacsclient --socket-name=water --eval '(progn (find-file "netherlands3.svg") (goto-char (point-min)) (search-forward "ITINERARY MARKERS"))'
+```
+
+### Check marker count
+```bash
+emacsclient --socket-name=water --eval '(with-current-buffer (find-file-noselect "netherlands3.svg") (count-matches "marker-" (point-min) (point-max)))'
+```
+
+## SVG + nxml-mode Tips
+
+- SVG files open in `nxml-mode` automatically — syntax highlighting and tag matching
+- `C-c C-f` / `C-c C-b` — fold/unfold XML elements (navigate large SVG layers)
+- `C-c C-n` — narrow to current element (focus on one marker)
+- `M-x nxml-balanced-close-start-tag` — auto-close SVG tags
+
+## Integration with geo2svg.py
+
+After running `python3 geo2svg.py --builtin netherlands3.svg`:
+1. Emacs auto-reverts if `auto-revert-mode` is on
+2. Otherwise: `M-x revert-buffer` in the SVG buffer
+3. Check diff: `M-x magit-diff-buffer-file` or `C-x v =`
+
+## Inkscape ↔ Emacs Handoff
+
+When editing in Inkscape:
+- Save in Inkscape → Emacs auto-reverts the buffer
+- Edit source in Emacs → reload in Inkscape (`F5` or reopen)
+- Use `git diff` before committing to filter Inkscape metadata noise