[log] Add debug logging to tracing/http.go WrapHTTPHandler

[github-actions]

Adds 4 meaningful debug log calls to internal/tracing/http.go using the existing logTracing logger declared in provider.go (same tracing package, no new logger declaration needed).

Changes

File: internal/tracing/http.go

Three categories of debug log calls added to WrapHTTPHandler:

1. Handler registration — logs when a handler is wired up with its OTel span name and the number of extra attributes:

   Registering HTTP handler with OTel span: span=mcp.tool_call, extraAttrs=2
   ```
   
   

2. Per-request entry — logs the span name, HTTP method, path, and whether an incoming W3C traceparent header was found (i.e., whether this is a continuation of a distributed trace or a fresh root trace):

   Handling request: span=mcp.tool_call, method=POST, path=/mcp, remoteParent=true
   

3. Post-span-start — logs the generated or propagated trace ID for cross-system correlation:

   Span started: span=mcp.tool_call, traceID=4bf92f3577b34da6a3ce929d0e0e4736
   

No Side Effects

• logTracing is already declared in provider.go in the same package — no new logger variable added
• oteltrace.SpanContextFromContext(ctx).IsRemote() is a pure read with no side effects
• span.SpanContext().TraceID() is a pure read; formats to hex via %s
• All logging is gated by DEBUG=tracing:* or DEBUG=* — zero overhead when disabled

Quality Checklist

• Exactly 1 file modified
• No test files modified
• Reuses existing logTracing logger (no duplicate declaration)
• Logger namespace follows pkg:filename convention (tracing:provider)
• Log arguments have no side effects
• Logging messages are meaningful and diagnostic
• No duplicate logging with existing log calls

Note

🔒 Integrity filter blocked 1 item

The following item were blocked because they don't meet the GitHub integrity level.

• search_code:open-telemetry/opentelemetry-go search_code: has lower integrity than agent requires. The agent cannot read data with integrity below "unapproved".

To allow these resources, lower min-integrity in your GitHub frontmatter:

tools:
  github:
    min-integrity: approved  # merged | approved | unapproved | none

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