Moves docs/turn-journal-rfc.md → docs/rfcs/turn-journal.md, establishing
the convention for future design documents on hermes-webui's data-at-rest
and recovery surfaces. Adds docs/rfcs/README.md describing when an RFC
applies (large changes, durability/recovery semantics, new infrastructure
primitives) and the simple status header convention.
Polish on turn-journal.md:
- Added 3-line status header (Status / Author / Created) at top.
- Light tone edits on two flourishes that read fine in a PR description
but felt off in permanent repo documentation. Author's voice preserved
throughout the rest of the document.
Co-authored-by: ai-ag2026 <261867348+ai-ag2026@users.noreply.github.com>
nesquena-hermes