Milestone #2 increment A: the product's real publish flow, distinct from
git_push's fresh-init-per-boot throwaway branch. open-or-clone a persistent
/spiflash/repo, append to a tracked notes.md, commit on top of the branch,
and fast-forward push over mbedTLS HTTPS+PAT. Reconcile handles up-to-date
and fast-forward; a true divergence (merge commit on FATFS) is deferred to
increment B. Runs on the dedicated 96 KB git thread; gated behind `git`.
Compiles clean; on-device clone/open+fast-forward not yet hardware-verified
(clone/checkout is deeper than the proven init path — the flash may need a
GIT_STACK bump).
Wi-Fi + SNTP + flash-FAT + libgit2 in one bench binary: init a fresh working
copy, commit, and push a per-boot device/<unix> branch over mbedTLS HTTPS with
PAT auth. Gated behind the `git` feature; built/flashed via `just flash-git-push`.
Status: local git init verified on hardware; the ODB-write fix and the full
push are not yet confirmed end-to-end on device. Cert verification is bypassed
in the push callback (spike shortcut) -- real trust-store wiring must land
before this leaves the bench.
Standalone bench program (src/bin/sd_fat.rs, `just flash-sd`) that mounts
FAT over the EPD's shared SPI2 bus and proves the persistence module's
atomic save: write .tmp, fsync, rename, read back and compare.
Runs SD-only: the EPD's SpiBusDriver holds an exclusive bus lock for its
lifetime, so an arbitrated SD device can't be live alongside it yet. Keeps
CRC required and maps a card that rejects CMD59 to a clear "use a genuine
card" message rather than running the user's notes over an unchecked bus.
sdkconfig gains CONFIG_FATFS_LFN_HEAP (the atomic-save .tmp name isn't valid
8.3) and, temporarily, CONFIG_LOG_MAXIMUM_LEVEL_DEBUG to read the drivers'
per-command R1 bytes during bring-up.
Standalone `wifi_tls` binary: station assoc, SNTP, then a validated
HTTPS GET to api.github.com against the esp-idf cert bundle. Gates
Spike 7 (gitoxide push). Creds come from firmware/.env via build.rs.
