The `bd comment --no-db` command was failing because
initializeNoDbMode() set the global `store` but never set
`storeActive = true`. When comments.go called ensureStoreActive(),
the guard check failed and it tried to find a SQLite database,
returning an ironic error telling the user to use --no-db.
Why only `comment` was affected:
- Commands like `create`, `update`, `close` use `store` directly
- The `comment` command calls `ensureStoreActive()` first as a safety check
- That function guards on `storeActive && store != nil`
- Since `storeActive` was never set, the guard failed and it looked for SQLite
The fix aligns no-db mode with what ensureStoreActive() expects.
0575ca9bd9