[Feature] Improve error messages

[scarowar]

Summary

Provide more helpful error messages for common failures.

Problem to solve

When inso fails, users see generic "Inso CLI Error" messages. More context would help debugging.

Proposed solution

Detect common error patterns and provide actionable guidance:

1. "No collection found" → Suggest checking identifier and working-directory
2. "Environment not found" → List available environments
3. "Connection refused" → Suggest checking if API server is running
4. Timeout → Suggest increasing execution-timeout

Implementation:
Add error pattern matching in runner.py:

ERROR_HINTS = {
    "no collection": "Check that --identifier matches a collection name in your workspace",
    "environment not found": "Available environments can be found in Insomnia's environment dropdown",
    "ECONNREFUSED": "Ensure your API server is running and accessible",
}

Alternatives considered

No response

Additional context

Files to modify:

• src/insomnia_run/runner.py (add error detection)
• src/insomnia_run/reporter.py (display hints in report)

[scarowar]

This was generated by AI during triage.

Triage: wontfix — fix-only v0.2.0 deferral

v0.2.0 is fix/hardening only (per CONTEXT.md + spec.md:91 non-goals). This enhancement is valid but deferred to v0.3.0 after validation. Spec D7 already drops rich (insomnia-run#54) and Scorecard is already present as .github/workflows/scorecards.yml. Keeping scope tight so enterprise rate-limit/GHES hardening ships cleanly. Will re-triage in v0.3.0.