Remove dead cmd/rebucketing-tool and orphan cmd/audit-consumer (#1233)

* chore: Remove dead cmd/rebucketing-tool and orphan cmd/audit-consumer

cmd/rebucketing-tool has no main.go entry point and zero imports anywhere
in the codebase. Its functionality was absorbed into
cmd/position-tool/internal/rebucket/.

cmd/audit-consumer is an orphan duplicate entry point that is never built.
The canonical entry point is services/audit-worker/cmd/.

Also fixes a stale comment in position-tool referencing the removed package
and updates a broken README link in tests/audit-e2e.

* docs: Add CLI tools reference guide and ibactl to deployment runbook

Add docs/guides/cli-tools.md documenting all operational CLIs:
tenantctl, ibactl, instrument-cli, position-tool, market-data-tool,
and meridian-cli. These tools had zero discoverability despite being
actively used.

Add ibactl internal account provisioning step to the production
deployment smoke test in the deployment runbook.

* docs: Address review feedback on CLI tools guide

Clarify intro to note position-tool uses direct DB access and
meridian-cli is offline, rather than implying all tools use gRPC.
Replace placeholder <tenant-port> with actual port 50056.

---------

Co-authored-by: Ben Coombs <bjcoombs@users.noreply.github.com>

Author: bjcoombs

cmd/audit-consumer/main.go

@@ -189,11 +189,9 @@ var (
 )
 
 // executeRebucket performs the actual rebucket operation.
-// It integrates with the rebucketing-tool's internal packages for:
-// 1) Fetching positions by instrument
-// 2) Recalculating bucket keys using instrument CEL expressions
-// 3) Batch updating positions with audit logging
-// 4) Progress reporting
+// It fetches positions by instrument, recalculates bucket keys using
+// instrument CEL expressions, batch updates positions with audit logging,
+// and reports progress.
 func executeRebucket(ctx context.Context, cfg *rebucketConfig) (*rebucketResult, error) {
 	logger := slog.Default()