Enforce Genarrative play-type SOP and update docs

Rewrite Genarrative play-type integration guidance across .codex and .hermes to define a platform-level SOP: default to form/image workbench, unify single-image asset slots (CreativeImageInputPanel), standardize series-material sheet->cut->transparent->OSS pipeline, and forbid copying legacy chat/agent workflows as the default. Add decision-log entry freezing the SOP and a pitfalls note warning against direct reuse of old play tools. Update CONTEXT.md and docs/README.md, add a new PRD file, and apply related small server-side changes (module-auth, spacetime-client mappers and runtime) to align back-end code with the new contracts and flows.

server-rs/crates/module-jump-hop/src/commands.rs

@@ -0,0 +1,18 @@
+use shared_kernel::normalize_required_string;
+
+use crate::JumpHopDifficulty;
+
+pub fn parse_jump_hop_difficulty(value: &str) -> JumpHopDifficulty {
+    match value.trim().to_ascii_lowercase().as_str() {
+        "easy" | "轻松" => JumpHopDifficulty::Easy,
+        "advanced" | "进阶" => JumpHopDifficulty::Advanced,
+        "challenge" | "挑战" => JumpHopDifficulty::Challenge,
+        _ => JumpHopDifficulty::Standard,
+    }
+}
+
+pub fn normalize_jump_hop_seed(seed: &str, fallback: &str) -> String {
+    normalize_required_string(seed)
+        .or_else(|| normalize_required_string(fallback))
+        .unwrap_or_else(|| "jump-hop".to_string())
+}