* feat: Command Code support
Reads the cmd CLI's session transcripts at
~/.commandcode/projects/<slug>/<id>.jsonl (CODEBURN_COMMANDCODE_DIR moves
the root). Checkpoint and prompt sidecars are skipped.
usage.inputTokens includes cacheReadTokens, so fresh input is
inputTokens - cacheReadTokens. The recorded costUsd is kept per call
(costFromBilling); a call without one is priced from tokens and marked
estimated. Forks copy parent message ids into a new file, so calls dedupe
by message id across sessions.
Desktop: Electron sandbox read path, macOS and Windows change watchers,
Windows tab colour. No quota adapter.
* fix(command-code): dedupe on meta.messageId, not the 8-hex line id
The top-level id is randomUUID().slice(0, 8) and only unique within one
file, so calls from unrelated sessions could collide and vanish.
meta.messageId is a full uuid that survives forks. Fixture ids now use
the real 8-hex shape.
* test(command-code): check sidecar skipping by file name, not a posix path
