bug: branch-compare command and programmatic API crash — missing branch-compare.js

[carlos-alm]

Found during dogfooding v2.5.0

Severity: Critical
Command: codegraph branch-compare main HEAD and import('@optave/codegraph')

Reproduction

npm init -y && npm install @optave/codegraph@2.5.0
npx codegraph branch-compare main HEAD
# ERR_MODULE_NOT_FOUND: Cannot find module '.../src/branch-compare.js'

node --input-type=module -e "import('@optave/codegraph').then(m => console.log(Object.keys(m))).catch(e => console.error(e.code))"
# ERR_MODULE_NOT_FOUND

Expected behavior

• branch-compare should either work or not be registered as a CLI command
• import('@optave/codegraph') should return the programmatic API without crashing

Actual behavior

1. branch-compare crashes with ERR_MODULE_NOT_FOUND — the file src/branch-compare.js does not exist in the source repo
2. import('@optave/codegraph') crashes because src/index.js line 9 has a top-level re-export: export { branchCompareData, branchCompareMermaid } from './branch-compare.js'

The second issue is critical — it makes the entire programmatic API unusable.

Root cause

The branch-compare command was registered in cli.js and its exports added to index.js, but the implementation file src/branch-compare.js was never created/committed.

Suggested fix

Remove the branch-compare references from cli.js (lines 826–843) and index.js (line 9) until the implementation exists. The command definition in --help is misleading, and the index.js export makes the entire package unusable programmatically.