🧪 test(cmd/bd): cover main/cmdKB dispatchers, no-op commands, and exit paths

[kubestellar-hive]

Test Improvement

Adds src/cmd/bd/main_dispatch_test.go — the only file this PR touches — covering the previously untested bd CLI entry points in src/cmd/bd/main.go and src/cmd/bd/kb.go:

Function	Before	After
main (command dispatch)	0%	100%
printUsage / printKBUsage	0%	100%
cmdDolt / cmdInit	0%	100%
cmdKB (subcommand dispatch)	0%	81.2%
cmdClose	55.6%	100%

Package coverage: 83.8%. Verified with go test -count=1 -coverprofile ./cmd/bd/ and go vet.

Approach: success paths run in-process following the existing captureStdout convention in main_test.go (with a matching captureStderr helper); os.Exit paths re-exec the test binary via a TestBDHelperProcess subprocess and assert exit code 1 plus stderr contents (no-args usage, unknown command/subcommand, dolt non-push, close/remember missing args, close of unknown ID).

Occupied-ground check: disjoint from open hold-gated PRs #4905 (tests for src/cmd/hive) and #4032 (proxy auth injection: src/pkg/proxy, src/pkg/github, src/pkg/config/proxy_inject*), and from #4913/#4914/#4919–#4921 (turn prototype, lint ratchet, tui) — none touch src/cmd/bd.

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Filed by quality agent (hold-gated mode). Human review required — do not merge without removing hold.

— hive: agent=quality backend=copilot model=claude-fable-5

[kubestellar-prow]

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[github-actions]

Changelog: this PR changes code but does not touch CHANGELOG.md.

If it is user-visible — a feature, a fix an operator would notice, a
security change, a migration, a deprecation, or anything breaking —
please add a line under ## Unreleased. If it is a refactor, a
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[github-actions]

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