Fix session memory injection logic and prevent duplicate memory entries

[panchaldhruv27223]

Summary

This PR fixes and simplifies session memory handling in the 'examples/agents_sdk/context_personalization.ipynb' notebook.

It addresses two related issues:

1. Context Loss: Session memory was only injected in a trim-gated, one-shot manner, which could cause recent conversational context to be unavailable in subsequent turns.
2. Redundancy: Repeated calls to save session memory could create duplicate entries, leading to unnecessary memory growth and noise.

The changes ensure that session memory is injected consistently when available, and that identical session notes are updated instead of duplicated.

Motivation

In tool-heavy and iterative conversations, recent session context is often required across multiple turns, not only after a trim event. The previous trim-gated injection could lead to loss of short-term context in these cases.

Additionally, session memory notes were previously append-only, allowing identical notes to accumulate over time. This PR introduces a simple deduplication mechanism to keep session memory concise and up to date.

These changes improve:

• Conversational continuity
• Memory signal quality
• Deterministic agent behavior
• Long-session stability

Changes Included

• Inject session memory eagerly when notes are present, instead of relying solely on trim-triggered injection.
• Reset deferred injection flags to avoid duplicate or delayed memory usage.
• Update existing session memory notes when the same text is saved again, rather than appending duplicates.
• Refresh timestamps and keywords for updated session memory entries.

No changes were made to global or long-term memory behavior.

Notes

• This PR intentionally changes session memory from trim-gated to data-driven injection.
• Token usage may increase slightly due to more consistent memory inclusion.
• Behavior is otherwise backward compatible outside of session memory injection timing.
• This behavior can be gated behind a configuration flag if a trim-gated default is preferred.

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Codex Review: Didn't find any major issues. Breezy!

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