plots: dejargon, drop redundant titles, emit png+svg+pdf, CSV re-render

Audit of all 4 plot scripts (plot_dynamics/substrate/emergence/deploy_overlay):
- One save_fig(fig, path) helper in figs.py writes png+svg+pdf (vector for the
  paper, png for the blog). All scripts call it.
- arm_label() map: reader-facing names only -- route2->route, drop 'knob'/'the
  cheat' from titles and the train-vs-deploy story (adapter on/off, reward hack).
- Titles off by default (the paper/blog caption carries it); --title re-enables
  for standalone research use.
- dump_data CSV now carries every plotted series; plot_dynamics --from-csv
  re-renders the three figures from the committed CSV with no logs (logs/ and
  out/runs/ are gitignored; out/figs/*.csv is tracked). Round-trip verified.
- Commit the regenerated dyn_sub4 figures in all 3 formats + the CSV.

Co-Authored-By: Claudypoo <288921227+claudypoo@users.noreply.github.com>

src/projected_grpo/figs.py

@@ -16,6 +16,33 @@ from pathlib import Path
 
 FIGS_DIR = Path("docs/figs")
 
+# Reader-facing arm names. Code/log tags carry our internal vocabulary
+# (route2 = the current routing arm; "knob" = the delta_S adapter); plots must
+# not. Map every internal tag to the word a paper reader sees. Anything missing
+# falls through to its raw tag, so a new arm shows up loud rather than silently
+# mislabelled.
+ARM_DISPLAY = {
+    "routing2": "route", "route2": "route",
+    "routing2_grad": "route", "routing2_act": "route (act)",
+    "projected": "erase", "route": "route", "erase": "erase", "vanilla": "vanilla",
+}
+
+
+def arm_label(tag: str) -> str:
+    return ARM_DISPLAY.get(tag, tag)
+
+
+def save_fig(fig, png_path: Path, formats=("png", "svg", "pdf")) -> Path:
+    """Save one figure to every format (vector .svg/.pdf for the paper, .png for
+    the blog/preview) and return the .png path. matplotlib picks the writer from
+    the suffix, so we just swap it. bbox_inches='tight' so titleless figures
+    don't leave a margin where the suptitle used to be."""
+    png_path = Path(png_path)
+    png_path.parent.mkdir(parents=True, exist_ok=True)
+    for ext in formats:
+        fig.savefig(png_path.with_suffix(f".{ext}"), dpi=150, bbox_inches="tight")
+    return png_path
+
 
 def link_latest(out_path: Path) -> Path:
     """Point docs/figs/<out_path.name> at out_path (relative symlink). Returns the link."""