docs(cli): refresh stale root --help string

[saadqbal]

Summary

Closes #19.

The root command's Long help (shown on tracebloc --help) still claimed the binary "implements only version and completion" and pointed at the roadmap for "subsequent phases" — stale since v0.1 shipped dataset/ingest/cluster. PR #18 refreshed the README and the three other user-facing --help strings (cluster info, dataset, dataset push) but missed this one. Now describes the shipped command set.

Docs/strings only — no behavior change.

Diff

-Today this binary implements only `version` and `completion` — see .../147 ... Subsequent phases land subcommands incrementally.
+This binary implements the full v0.1 ingestion path: `dataset push` (the dominant workflow above), `ingest validate` for a local
+schema check, `cluster info` for discovery diagnostics, plus `version` and `completion`. See .../147 for the v0.1 roadmap and what's planned next.

Verification

go build, go vet ./..., go test ./... (all 5 pkgs), and gofmt -s -l all clean. No test pinned the old string. Rendered tracebloc --help confirmed to list the shipped commands.

🤖 Generated with Claude Code

---

Note

Low Risk
Documentation-only change to a help string; no runtime or CLI behavior is modified.

Overview
Updates the root command Long text shown on tracebloc --help so it no longer says the binary only ships version and completion.

It now documents the v0.1 surface: dataset push, ingest validate, cluster info, plus version and completion, with the same roadmap link reframed as what’s planned next rather than “subsequent phases.”

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[LukasWodka]

👋 Heads-up — Code review queue is at 12 / 8

Above the WIP limit. The team convention is to review existing PRs before opening new work.

Open PRs currently in Code review (oldest first):

• averaging-service#98 — ci: add fr-gate caller workflow · author: @LukasWodka · no reviewer assigned
• client#191 — fix(#190): fail image-refresh loudly when the ingestor (ghcr) digest can't resolve · author: @saadqbal · no reviewer assigned
• client-runtime#75 — dev to staging · author: @shujaatTracebloc · reviewer: @saadqbal
• data-ingestors#146 — test(schema): lock category enum to the engine's TaskCategory (anti-drift) · author: @LukasWodka · reviewer: @saadqbal
• design-system#19 — fix: un-track coverage/ and node_modules/ from git · author: @LukasWodka · no reviewer assigned
• design-system#22 — ci: add Vitest test workflow · author: @LukasWodka · reviewer: @aptracebloc
• design-system#23 — ci: add fr-gate caller workflow · author: @LukasWodka · no reviewer assigned
• docs#46 — docs: make declarative-ingest staging self-contained (data-ingestors#131 B/C) · author: @divyasinghds · no reviewer assigned
• frontend-app#499 — ci: add Vitest + Cypress test workflow · author: @LukasWodka · reviewer: @aptracebloc
• model-zoo#77 — ci: add fr-gate caller workflow · author: @LukasWodka · no reviewer assigned

Pull from review before opening new work. (This is a nudge from the kanban WIP check, not a block.)