feat: add 4 new crates (queue, tracing, http, cli) + enhancements to existing crates

New crates:
- mytheclipse-queue: unified job queue with WorkerPool, retry/backoff, DLQ
  Backends: in-memory (default), Redis, NATS, PostgreSQL
- mytheclipse-tracing: tracing subscriber layers with env filter + OTLP/Jaeger export
- mytheclipse-http: HTTP client/server with timeout + tracing, axum server
- mytheclipse-cli: CLI framework with clap derive, built-in subcommands

Enhancements to existing crates:
- mytheclipse-core: SemaphorePool, LeaderElection, HealthRegistry/HealthCheck
- mytheclipse-cache: AutoRefreshCache (bg refresh on miss), CacheMetrics
- mytheclipse-config: ConfigSchema for JSON Schema generation
- mytheclipse-storage: MultipartUploadDriver trait
- mytheclipse-crypto: PASETO v4.local token support

All features compile with --all-features; tests + clippy pass clean.

crates/mytheclipse-tracing/README.md

@@ -0,0 +1,50 @@
+# mytheclipse-tracing
+
+Pre-built tracing infrastructure for mytheclipse applications, wrapping
+[`tracing-subscriber`] with sensible defaults and optional OTLP/Jaeger/Zipkin
+export.
+
+## Features
+
+| Feature | Default | Description |
+| :--- | :---: | :--- |
+| `env` | yes | `tracing-subscriber` with `EnvFilter` support. |
+| `otel` | no | OpenTelemetry OTLP gRPC exporter. |
+| `jaeger` | no | Jaeger thrift over `tracing-flame`. |
+| `zipkin` | no | Zipkin exporter (stub — extend as needed). |
+| `full` | — | Enables `otel` + `jaeger`. |
+
+## Usage
+
+```toml
+[dependencies]
+mytheclipse-tracing = "0.2"
+```
+
+### Basic subscriber
+
+```rust
+use mytheclipse_tracing::TracingLayer;
+
+fn main() {
+    TracingLayer::install();
+    tracing::info!("hello, world!");
+}
+```
+
+### With OTLP export
+
+```toml
+[dependencies]
+mytheclipse-tracing = { version = "0.2", features = ["otel"] }
+```
+
+```rust
+use mytheclipse_tracing::TracingLayer;
+
+fn main() {
+    TracingLayer::install();
+    // OTLP exporter defaults to http://localhost:4317
+    tracing::info!("span data sent to OTLP collector");
+}
+```