Alan-Jowett / sonde / 23991722055

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Replace `tmp102_handler.py` with Rust binary (#653)

* Replace 	mp102_handler.py with Rust binary

Convert the TMP102 gateway handler from a Python script requiring
python3 + cbor2 into a self-contained Rust executable
(\sonde-tmp102-handler\).  This eliminates the Python runtime
dependency on the target system.

The new crate lives at \crates/sonde-tmp102-handler/\ and is a
workspace member built alongside all other crates.  Behavior is
identical to the Python original:

- Reads length-prefixed CBOR \DATA\ messages from stdin
- Decodes 6-byte TMP102 temperature payloads
- Appends JSON Lines records to \	emperature_log.jsonl\
- Logs to stderr
- Replies with \DATA_REPLY\ on stdout

Includes 9 unit tests covering CBOR round-trip, TMP102 decoding
(valid, wrong-length, negative temps), hex encoding, EOF handling,
and the \map_get\ helper.

Also enforces the 1 MB message size limit per GW-0502 and avoids
u64-to-i64 overflow on \equest_id\ in DATA_REPLY.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Fix rustfmt formatting

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Remove accidentally committed data files

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Ignore handler data files

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Restore Python handler alongside Rust version

Keep both \	est-programs/tmp102_handler.py\ (readable protocol
example) and \sonde-tmp102-handler\ (zero-dependency Rust binary).
Update deployment SOP to document both options.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Address review: use constants in DATA_REPLY, add build step to SOP

- Use \KEY_MSG_TYPE\, \KEY_REQUEST_ID\, and new \KEY_REPLY_DATA\
  constants in the DATA_REPLY construction instead of raw integers.
- Add explicit \cargo build -p sonde-tmp102-handler --release\ step
  to deployment SOP before handler registration.
- Document that \	emper... (continued)

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