…h agent/is_agent/is_interactive

• All tests passed. If this feature is not already covered by the tests, I added new tests.
• All static analysis checks passed.
• This pull request is on the master branch.
• I used gofmt for formatting the code before submitting the pull request.

Summary

Adds detection of CLI invocation context — AI agent (Claude, Cursor, Gemini, Goose, Copilot, Kilocode, Roo Code, Codex) and interactive-terminal presence — and
enriches the existing jfcli_commands_count metric and outbound User-Agent header with the new dimensions. Also extends the existing CI provider list with
Harness.

Motivation

RTECO-1017: differentiate human / CI / agent invocations of jf. Backend currently can't tell whether a
command came from a developer's desktop, a CI runner, or an AI agent. Without this, we can't measure agent-driven usage or separate human vs automated traffic.

Changes

• New common/commands/execution_context.go — invocation-context detection.
  • ExecutionContext struct: Agent, IsAgent, IsInteractive, TraceID.
  • DetectExecutionContext() populates the struct from env vars + terminal probe.
  • EnrichUserAgent(base string) string — returns the base User-Agent appended with (agent; ci=<system>) context. Used by jfrog-cli's SetUserAgent call.
  • Reuses clientlog.IsStdOutTerminal() from jfrog-client-go/utils/log for cached + test-overridable TTY detection. No direct dependency on
    golang.org/x/term.
• New common/commands/execution_context_test.go — table-driven tests sourced from agentEnvDetectors (single source of truth), plus trace-ID gating,
  no-env fallback, and EnrichUserAgent combinations.
• Extended utils/metrics/metrics.go — MetricsData gains IsAgent, Agent, IsInteractive (additive, omitempty).
• Updated common/commands/metrics_collector.go:
  • CollectMetrics populates the new fields via DetectExecutionContext.
  • Detection runs outside the mutex; lock now scopes only the map write.
  • Added HARNESS_BUILD_ID → harness to the CI provider list.

Agent detection

First match wins. Generic AGENT env collapses to the literal unknown to keep label cardinality bounded.

Dropped from the initial draft (no verified per-invocation subprocess marker): windsurf, aider, replit.

Trace-ID propagation

TraceID is gated on agent identity — only Cursor's CURSOR_TRACE_ID is honored, and only when the detected agent is cursor. Prevents stale values leaked
from an outer shell (e.g. a Cursor env present while the real invoker is Claude Code) from being reused.

User-Agent enrichment

EnrichUserAgent(base) appends (agent), (ci=<system>), or (agent; ci=<system>) to the base. Returns the base unchanged when neither is detected. The
jfrog-cli main.go change (separate PR) calls this once at startup.

Depends on:

1. RTECO-1017 - Enrich User-Agent with agent/CI context and reuse Cursor… jfrog-cli#3468