A SimpleX Chat bot that answers arithmetic (closes #1)

Remove the template's HTTP service, database and fx wiring. Add exact
arithmetic on go/parser and go/constant, a client that runs simplex-chat
as a child process and drives its WebSocket API, and the bot, which keeps
an auto-accepting address and replies to each message. The image adds the
checksum-pinned simplex-chat v7.0.2 on Ubuntu 22.04.

Model: opus-5-5

docs/TODO.md

@@ -10,44 +10,29 @@
 
 # Status
 
-pre-1.0. No git tags exist. `main` is a working HTTP service that
-builds, tests and lints clean: cobra command tree, `fx` object graph,
-viper configuration that aborts on an unparseable value, sqlite with an
-embedded schema and a migration runner, embedded templates and static
-assets, the full middleware chain (request id, logging, metrics, panic
-recovery, request timeout, body cap, security headers, CSRF), Sentry,
-and Prometheus `/metrics` behind optional basic auth.
-
-This repository is a template. A project seeded from it should replace
-this Status section and everything below it, keeping the Workflow
-section above unchanged.
+pre-1.0. No git tags exist. `main` is a working bot: one container image
+holding the bot and the SimpleX Chat command-line client v7.0.2, a bot
+profile named `calc` with a long-term address that accepts every contact
+request, and exact arithmetic replies (`+ - * /`, parentheses,
+decimals). The Gitea issue tracker is the authoritative list of work;
+this file mirrors it.
 
 # Next Step
 
-Replace `gomodguard` with `gomodguard_v2` in `.golangci.yml`.
-golangci-lint v2.12.2 emits a deprecation warning for it on every run
-(`the linter 'gomodguard' is deprecated (since v2.12.0) ... Replaced by gomodguard_v2`).
-Neither is configured with rules here, so the change is to the `linters`
-block only; done when `make lint` runs clean with no deprecation warning
-in the output.
+Adopt the canonical `.golangci.yml` from the `prompts` repository once
+it replaces `gomodguard` with `gomodguard_v2`. golangci-lint v2.12.2
+warns on every run that `gomodguard` is deprecated. The file is
+maintained upstream and is not edited here; done when `make lint` runs
+with no deprecation warning.
 
 # Completed Steps
 
-- 2026-08-22 Built the template out from an empty repository: STRTA
-  `script/` entrypoints with `Makefile` shims, `Dockerfile` and
-  `Dockerfile.lint` on digest-pinned bases, Gitea workflow running
-  `script/cibuild`, `.golangci.yml`, `.editorconfig`, `.prettierrc`,
-  `docs/REPO_POLICIES.md`, `AGENTS.md`, the HTTP service and its tests,
-  and `script/rename` for seeding
+- 2026-09-26 Seeded from `go-template-repo` (renamed, its HTTP service
+  removed) and built the bot: `internal/calc` for the arithmetic,
+  `internal/simplex` for the chat client process and its WebSocket API,
+  `internal/bot` for address setup and replies, and a runtime image on
+  Ubuntu 22.04 carrying the checksum-verified `simplex-chat` binary
 
 # Future Steps
 
-- Add a `docker-compose.yml` showing the service behind a
-  TLS-terminating reverse proxy with `X-Forwarded-Proto` set, since that
-  is the deployment shape the CSRF middleware is written for and the one
-  an operator is most likely to get wrong
-- Add a `script/release` that tags, builds with `VERSION` set, and
-  pushes the image, so `globals.Version` is something other than `dev`
-  in a real deployment
-- Decide whether the template should ship a session/auth layer or stay
-  deliberately without one
+none