chore(linkedin-studio): release v0.5.1 — SB-S1 ingest + gold signal

Bump version declarations 0.5.0 → 0.5.1 (plugin.json SSOT + README badge +
CLAUDE.md header + CHANGELOG [0.5.1] entry) for SB-S1. Flip the architecture
SB-S1 row to landed (+ top status). Additive minor: no command/agent/ref/skill
count change; voice-trainer's learning behaviour changes (published-only).
Gate 93/0/0. Polyrepo release (tag v0.5.1 + catalog ref bump) pending push window
+ operator confirm (public open/ remote).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RigJBiRFNtFZKCz21qNbQ4

README.md

@@ -6,7 +6,7 @@
 
 *AI-generated: all code produced by Claude Code through dialog-driven development. [Full disclosure →](../../README.md#ai-generated-code-disclosure)*
 
-![Version](https://img.shields.io/badge/version-0.5.0-blue)
+![Version](https://img.shields.io/badge/version-0.5.1-blue)
 ![Platform](https://img.shields.io/badge/platform-Claude_Code_Plugin-purple)
 ![Commands](https://img.shields.io/badge/commands-29-green)
 ![Agents](https://img.shields.io/badge/agents-19-orange)