fix(cli): ignore null profile envelope metadata

[ZaynJarvis]

Summary

• Treat profile: null in success envelopes as absent when the Rust CLI unwraps dynamic JSON results.
• When real non-null profile metadata is preserved in compact JSON output, emit the server-style status/result/profile envelope instead of nesting profile inside result.
• Preserve existing no-profile compact CLI JSON output (ok/result) and existing table/text profile rendering behavior.
• Add regression tests for ls-style list responses, profiled object responses, and null profile handling.

Root Cause

PR #2125 (e9e6ce5, "Feature/http profile middleware") added request-scoped HTTP profiling and introduced profile on the standard server response model. The server currently exposes success responses in this envelope shape:

{"status":"ok","result":[...],"error":null,"telemetry":null,"profile":null}

When profiling is inactive, profile is serialized as null. The same PR also added CLI profile-preserving unwrap logic for serde_json::Value: if an envelope has any profile key, unwrap_success_envelope() wraps or merges the payload with profile. Because that check treated profile: null as meaningful, commands like ls rendered an extra nested result layer in compact JSON output:

{"ok":true,"result":{"result":[...],"profile":null}}

A real non-null profile should also remain envelope metadata rather than becoming business payload. With this PR:

• inactive profile: null is treated as absent, so normal no-profile CLI output stays unchanged:

{"ok":true,"result":[...]}

• real non-null profile metadata is emitted in a server-aligned envelope shape:

{"status":"ok","result":[...],"profile":[...]}

This keeps the existing CLI compact ok/result convention for ordinary no-profile responses, but avoids inventing a second nested CLI envelope for profiled server metadata. This PR intentionally does not change the server response shape. PR #2215 only moved profile-aware table rendering order for component status output; it was not the source of this regression.

Test Plan

• cargo test -p ov_cli
• git diff --check
• cargo run -q -p ov_cli -- ls viking:// --output json
• Raw server check: GET /api/v1/fs/ls?uri=viking:// returns status/result/error/telemetry/profile envelope with profile:null when inactive.

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🎫 Ticket compliance analysis 🔶 2215 - Partially compliant Compliant requirements: (No changes directly related to this ticket) Non-compliant requirements: (No changes directly related to this ticket) Requires further human verification: (No changes directly related to this ticket) 2125 - Partially compliant Compliant requirements: (No changes directly related to this ticket) Non-compliant requirements: (No changes directly related to this ticket) Requires further human verification: (No changes directly related to this ticket)

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