Add PM-facing user stories for error handling rollout

[tzanko-matev]

Summary

• capture PM-ready user stories that summarize the structured error-handling and logging upgrades

Testing

• not run (documentation only)

---

https://chatgpt.com/codex/tasks/task_e_68e299c2b268832384dc4c536fe42de2

[github-actions]

Coverage Summary

Rust (lines)
78.9% covered (3,201 / 4,058 | 857 missed)

File	Lines	Miss	Cover
codetracer-python-recorder/crates/recorder-errors/src/lib.rs	157	7	95.5%
codetracer-python-recorder/src/code_object.rs	117	16	86.3%
codetracer-python-recorder/src/ffi.rs	196	19	90.3%
codetracer-python-recorder/src/lib.rs	15	15	0.0%
codetracer-python-recorder/src/logging.rs	478	80	83.3%
codetracer-python-recorder/src/monitoring/mod.rs	69	3	95.7%
codetracer-python-recorder/src/monitoring/tracer.rs	794	221	72.2%
codetracer-python-recorder/src/policy.rs	240	48	80.0%
codetracer-python-recorder/src/runtime/activation.rs	117	9	92.3%
codetracer-python-recorder/src/runtime/frame_inspector.rs	145	63	56.6%
codetracer-python-recorder/src/runtime/logging.rs	15	4	73.3%
codetracer-python-recorder/src/runtime/mod.rs	1,158	191	83.5%
codetracer-python-recorder/src/runtime/output_paths.rs	98	16	83.7%
codetracer-python-recorder/src/runtime/value_capture.rs	102	66	35.3%
codetracer-python-recorder/src/runtime/value_encoder.rs	88	6	93.2%
codetracer-python-recorder/src/session.rs	71	71	0.0%
codetracer-python-recorder/src/session/bootstrap.rs	183	14	92.3%

Python (statements)
61.5% covered (112 / 182 | 70 missed)

File	Stmts	Miss	Cover
codetracer-python-recorder/codetracer_python_recorder/__init__.py	7	0	100.0%
codetracer-python-recorder/codetracer_python_recorder/__main__.py	59	59	0.0%
codetracer-python-recorder/codetracer_python_recorder/api.py	5	0	100.0%
codetracer-python-recorder/codetracer_python_recorder/auto_start.py	22	9	59.1%
codetracer-python-recorder/codetracer_python_recorder/formats.py	13	1	92.3%
codetracer-python-recorder/codetracer_python_recorder/session.py	76	1	98.7%

Generated automatically via generate_coverage_comment.py.