Add configurable source to the memories feature

[winnal]

I recently implemented this: #13122

It would be great to have it implemented in the public release.

Summary: Currently memories takes only interactive sessions as a source for the history and memories when creating it through phase 1.

• This gives the option to change the source, like instead, only creating memories from exec sessions. This is good for those who use autonomous workflows like myself, which I prefer over interactive sessions. I like it to keep memories only during those sessions.
• Additionally, I also added an additional integration with my own personal skill which is like a proto-memory skill which I added before memories was introduced. It basically creates scratchpads for every task in each session and writes breadcrumbs and "lines of thought" to track its progress and retain context whenever compaction triggers. This adds that source into the memories system. Works very well. I can share that skill if requested.