fix(version): replace hardcoded v3.0.0 with dynamic _skill_version()

render.py, ui.py, and last30days.py had hardcoded "v3.0.0" in titles
and headers while plugin.json was at 3.1.1. Use _skill_version()
(reads from plugin.json at runtime) so version strings stay in sync.

Fixes #284

skills/last30days/scripts/last30days.py

@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 # ruff: noqa: E402
-"""last30days v3.0.0 CLI."""
+"""last30days CLI."""
 
 from __future__ import annotations
 

skills/last30days/scripts/lib/render.py

@@ -96,7 +96,7 @@ def render_compact(report: schema.Report, cluster_limit: int = 8, fun_level: str
     non_empty = [s for s, items in sorted(report.items_by_source.items()) if items]
     lines = [
         *_render_badge(),
-        f"# last30days v3.0.0: {report.topic}",
+        f"# last30days v{_skill_version()}: {report.topic}",
         "",
         *_assistant_safety_lines(),
         f"- Date range: {report.range_from} to {report.range_to}",
@@ -602,7 +602,7 @@ def render_comparison_multi(
 
     lines: list[str] = [
         *_render_badge(),
-        f"# last30days v3.0.0: {synthesized_topic}",
+        f"# last30days v{_skill_version()}: {synthesized_topic}",
         "",
         *_assistant_safety_lines(),
         f"- Comparison mode: {len(entities)} entities ({', '.join(entities)})",
@@ -790,7 +790,7 @@ def render_full(report: schema.Report) -> str:
     # Start with the same header as compact
     non_empty = [s for s, items in sorted(report.items_by_source.items()) if items]
     lines = [
-        f"# last30days v3.0.0: {report.topic}",
+        f"# last30days v{_skill_version()}: {report.topic}",
         "",
         *_assistant_safety_lines(),
         f"- Date range: {report.range_from} to {report.range_to}",

skills/last30days/scripts/lib/ui.py

@@ -6,6 +6,8 @@ import threading
 import random
 from typing import Optional
 
+from .render import _skill_version
+
 # Check if we're in a real terminal (not captured by Claude Code)
 IS_TTY = sys.stderr.isatty()
 
@@ -509,7 +511,8 @@ def show_diagnostic_banner(diag: dict):
 
     if IS_TTY:
         lines.append(f"{Colors.DIM}┌─────────────────────────────────────────────────────┐{Colors.RESET}")
-        lines.append(f"{Colors.DIM}│{Colors.RESET} {Colors.BOLD}/last30days v3.0.0 - Source Status{Colors.RESET}                 {Colors.DIM}│{Colors.RESET}")
+        _header = f"/last30days v{_skill_version()} - Source Status"
+        lines.append(f"{Colors.DIM}│{Colors.RESET} {Colors.BOLD}{_header}{Colors.RESET}{' ' * (52 - len(_header))}{Colors.DIM}│{Colors.RESET}")
         lines.append(f"{Colors.DIM}│{Colors.RESET}                                                     {Colors.DIM}│{Colors.RESET}")
 
         # Reddit
@@ -556,7 +559,8 @@ def show_diagnostic_banner(diag: dict):
     else:
         # Plain text for non-TTY (Claude Code / Codex)
         lines.append("┌─────────────────────────────────────────────────────┐")
-        lines.append("│ /last30days v3.0.0 - Source Status                 │")
+        _header_plain = f"/last30days v{_skill_version()} - Source Status"
+        lines.append(f"│ {_header_plain}{' ' * (52 - len(_header_plain))}│")
         lines.append("│                                                     │")
 
         if has_reddit and has_scrapecreators: