Add TODO.md and instructions

.claude/instructions.md

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+When asked "what's next?" or during downtime, check TODO.md and suggest items to work on.
+

TODO.md

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+- [ ] Update check script:
+  - [ ] Run `go fmt` on all .go files
+  - [ ] Run prettier on all .ts files
+  - [ ] Eventually, run unit tests
+
+- [ ] Adapt master program so that it reads configuration from command line
+  args instead of from environment variables
+  - Should have sane defaults
+  - Adding new arguments should be easy and obvious
+
+- [ ] Add wrapper script to run main program (so that various assumptions related
+  to relative paths are safer)
+
+- [ ] Add unit tests all over the place.
+  - ⚠️ Huge task - needs breakdown before starting
+
+- [ ] flesh out the `sync.sh` script
+  - [ ] update framework-managed node
+  - [ ] update framework-managed pnpm
+  - [ ] update pnpm-managed deps
+  - [ ] rebuild golang programs