feat: propagate error categories to SGP spans

[jshaikScale]

Summary

• capture exceptions raised inside ADK span context managers before ending the span
• define and export typed ApplicationError and PlatformError ownership markers with documented boundaries
• keep ordinary or unreliable failures classified as unknown
• emit flat error_category metadata alongside SGP status=ERROR, while remaining compatible with legacy records
• add coverage for typed classification, explicit precedence, fallback behavior, ADK capture, and SGP mapping

Test plan

• .venv/bin/pytest -n 0 tests/lib/core/tracing/test_span_error.py tests/lib/adk/test_tracing_module.py tests/lib/core/tracing/processors/test_sgp_tracing_processor.py (65 passed)
• Ruff checks on changed files
• Pyright checks on changed implementation files

Greptile Summary

Adds categorized span-error propagation across ADK tracing and SGP telemetry.

• Captures exceptions raised inside ADK span context managers before ending spans.
• Normalizes error ownership to application, platform, or unknown.
• Maps categorized errors to flat SGP error_category metadata.
• Exposes categorized exception classes and expands tracing tests.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
src/agentex/lib/adk/_modules/tracing.py	Captures and records exceptions from ADK span bodies before ending the span and re-raising.
src/agentex/lib/core/tracing/span_error.py	Introduces categorized exception types and normalized category storage in span error metadata.
src/agentex/lib/core/tracing/processors/sgp_tracing_processor.py	Adds normalized error-category metadata when converting failed Agentex spans to SGP spans.
src/agentex/lib/core/tracing/init.py	Publicly exports the new categorized tracing exception classes.
tests/lib/adk/test_tracing_module.py	Covers ADK context-manager error capture, span finalization, and exception propagation.
tests/lib/core/tracing/test_span_error.py	Covers category normalization, explicit precedence, fallback behavior, and SGP metadata mapping.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart LR
A[Exception raised in span body] --> B[set_span_error]
B --> C[Span data __error__]
C --> D[SGP tracing processor]
D --> E[SGP status ERROR]
D --> F[error_category metadata]
B --> G[Original exception re-raised]

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_{Reviews (2): Last reviewed commit: "fix: make error ownership classification..." | Re-trigger Greptile}