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## Why Codex memory updates currently rely on instructions that tell agents to create ad-hoc note files directly in the memory workspace. The memories extension already has a `MemoriesBackend` abstraction for local storage and future non-filesystem backends, so the ad-hoc note writer should live behind that same interface instead of baking local filesystem assumptions into the tool shape. ## What - Adds a `memories/add_ad_hoc_note` tool to the existing memories tool bundle. - Extends `MemoriesBackend` with `add_ad_hoc_note` plus request/response types so remote memory stores can implement the same operation later. - Implements the local backend by creating append-only notes under `extensions/ad_hoc/notes`. - Validates the tool-provided filename contract (`YYYY-MM-DDTHH-MM-SS-<slug>.md`), rejects path-like filenames, rejects empty notes, and uses create-new semantics so existing notes are never overwritten. - Keeps memories tool contribution behind the existing commented-out registration path; this defines the tool surface without newly exposing it through app-server. ## Test Plan - `just test -p codex-memories-extension`