fix(client): stream internal subprocess logs through PipeJSONStream

[skevetter]

Problem

Workspace stop/delete logs showed doubly nested JSON:

2026-08-21T00:06:18.836-0500    INFO    {"level":"debug","ts":"2026-08-21T00:06:18.836-0500","msg":"stopping Devsy container"}

Root cause

deleteContainer/stopContainer in workspace_client.go run
devsy internal agent workspace delete|stop as a subprocess and capture
its stdout/stderr with log.Writer(log.LevelInfo). cmd/internal/agent.go
always forces internal commands to --log-output json, so that subprocess
only ever emits structured JSON log lines. log.Writer's levelWriter just
re-logs each captured line verbatim as a message — wrapping the child's
already-JSON line inside another log record.

Fix

Use log.PipeJSONStream() instead, which parses each line and re-emits it
at its original level/message. This is the same pattern already used for
other internal JSON-emitting subprocesses (cmd/workspace/ssh.go,
cmd/workspace/gpg_tunnel.go, pkg/client/clientimplementation/proxy_client.go).
Close+drain moved to a defer so early-return paths (e.g. agentWorkspaceCommand
failing) still drain the pipe goroutine before returning.

Verification

• go build ./...
• go vet ./pkg/client/clientimplementation/...
• go test ./pkg/client/clientimplementation/...

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[github-actions]

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[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 0 complexity · 0 duplication

Metric	Results
Complexity	0
Duplication	0

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_{TIP This summary will be updated as you push new changes.}