MGS2 Master Collection 100% companion

A single-file companion page for 100%-ing Metal Gear Solid 2: Sons of Liberty
(Master Collection Version), plus an optional local helper for live Steam sync.

What's in it:
- Roadmap: the 5-pass plan plus a 48-step ordered walkthrough of the Tanker and
  Plant, with per-step sub-checklists for dog tags, achievements and items
- Achievements: all 51 with official Steam icons, missable/cumulative flags,
  filters, search and a full how-to for each
- Dog Tags: all 394 across 10 difficulty lists, with 81 conditional-spawn notes
- Area Maps: 10 guard-position maps rebuilt cell-by-cell from the community
  tracking spreadsheet, zoomable, with a label-size control
- Photos: 48 location screenshots pinned to the step where each thing is, with
  cross-source duplicates removed by perceptual hash
- Big Boss Run, Missables, VR/Extra Modes, Sources & Notes
- Steam sync: ticks what you already own from any public profile
- 10 dark colour themes, contrast-checked

The page is one self-contained HTML file with no build step or dependencies.

Compiled from community guides (Steam Community, Video Chums, u/Spikeyroxas,
Dayngl's Guides, TrueSteamAchievements) - see README for full credits.

.gitignore

@@ -0,0 +1,16 @@
+# progress exported from the page's Export button
+mgs2-progress.json
+mgs2-progress*.json
+
+# python
+__pycache__/
+*.py[cod]
+
+# os / editor cruft
+.DS_Store
+Thumbs.db
+*.swp
+*~
+
+# logs
+*.log