docs: draft CHANGELOG for 0.9.0 release

[AutomateIP]

Summary

Drafts the [0.9.0] CHANGELOG entry ahead of tagging. This is a MINOR release, not PATCH — the range since v0.8.0 includes new public API surface:

• feat: add named loggers, logger reset, and managed prefix registry #128: new logging API (get_logger, reset_logger, register_logger_prefix, loggers param on set_level/initialize)
• feat: add request timing to Response #126: Response timing (started_at, finished_at, elapsed_ms) — also a breaking change to Response.__init__ (now requires started_at/finished_at as keyword-only args)

Plus 20 other commits (Python 3.14/3.15 support, mypy/CI hardening, docs, fatal() behavior change, and the two dependabot CI bumps #129/#130).

Verification

Ran full itential-mcp integration testing against this commit range (ipsdk main @ baab19c, installed via local editable override, not PyPI):

• itential-mcp unit suite: 2858 passed
• Live platform run (real Itential Platform, OAuth): connection test, get_health, get_devices, get_jobs all succeeded end-to-end
• Confirmed no call sites in itential-mcp construct ipsdk.Response directly, so the breaking __init__ change has no consumer impact
• Confirmed no call sites use ipsdk.fatal()

No blockers found. Once this merges, v0.9.0 will be tagged from main to trigger the PyPI publish workflow.

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