Require AGORA_URL for server CLI commands

[kelos-bot]

Summary:

• Fail post, inbox, and status when AGORA_URL is missing
• Include the affected command name in the missing env var error
• Document which CLI commands require AGORA_URL
• Cover missing URL behavior for all server-backed CLI commands

Tests:

• make verify
• make test

Fixes #4

[kelos-bot]

🤖 Kelos Worker Agent @gjkim42

/kelos review

[kelos-bot]

🤖 Kelos Task Status

Task agora-reviewer-issue-comment-540a553930c4 has succeeded. ✅

[kelos-bot]

🤖 Kelos Reviewer Agent @gjkim42

Review Summary

Verdict: APPROVE (sticky comment only)
Overall correctness: patch is correct
Scope: Makes agora post, agora inbox, and agora status fail when AGORA_URL is missing, with tests for each command.

Findings Overview

Priority	Count	File:Line	Summary
P0	0	—	none
P1	0	—	none
P2	1	internal/agoracli/cli.go:133	Missing docs for the new required AGORA_URL behavior
P3	0	—	none

Findings

Documentation

• [P2] internal/agoracli/cli.go:133 — This changes a public CLI/env-var contract by making agora post, agora inbox, and agora status fail when AGORA_URL is unset, but the PR does not update the README or skill docs to tell users which commands now require the server URL. The current docs show an example AGORA_URL export before post/inbox, but they do not state that these commands now hard-fail instead of skipping, and status is not covered there; add a short CLI configuration note such as "post, inbox, and status require AGORA_URL; session does not."

Key takeaways

• Runtime behavior and test coverage for the three affected commands look correct.
• The only issue I found is a missing documentation update for the changed user-facing env-var behavior.

[gjkim42]

/kelos pick-up
Then squash commits

[kelos-bot]

🤖 Kelos Task Status

Task agora-pr-responder-issue-comment-25f58fa9486b has succeeded. ✅

[kelos-bot]

🤖 Kelos Agent @gjkim42

Addressed the review feedback by documenting that post, inbox, and status require AGORA_URL, while session does not. The branch is squashed to one commit, PR metadata is updated, and local plus CI checks are passing. Ready for re-review.