fix: clearer MOSTRO_PUBKEY setup error for first-time users

[VedantMadane]

Summary

Clearer MOSTRO_PUBKEY setup error

Changes

• Expand MOSTRO_PUBKEY missing error with ~/.config/mostro setup hint
• Clarify that the config directory is not auto-created

Fixes #184

Summary by CodeRabbit

• Bug Fixes
  • Improved configuration error guidance for missing MOSTRO_PUBKEY.
  • Added instructions for creating and sourcing ~/.config/mostro/env.sh, including a note that the directory must be created manually.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 7ffa3ffc-1dd7-49d1-af63-9dc4a27c9071

📥 Commits

Reviewing files that changed from the base of the PR and between 2c7a670 and ff7f4a2.

📒 Files selected for processing (1)

• src/cli.rs

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

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Walkthrough

The MOSTRO_PUBKEY configuration error now documents ~/.config/mostro/env.sh and states that the configuration directory must be created manually.

Changes

Configuration guidance

Layer / File(s)	Summary
Expand MOSTRO_PUBKEY setup guidance src/cli.rs	The error message now includes environment-file setup instructions and the manual directory-creation requirement.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to ff7f4

This is a localized clarification to the MOSTRO_PUBKEY setup error, with no actionable merge-blocking risk remaining beyond normal checks and review.

Suggested reviewers: grunch

Poem

A rabbit found a key in the shell,
And wrote its path where env vars dwell.
The folder waits for paws to make,
Then MOSTRO_PUBKEY guides the wake.
Setup now hops clear as day.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: improving the MOSTRO_PUBKEY setup error for first-time users.
Linked Issues check	✅ Passed	The change addresses issue #184 by clarifying MOSTRO_PUBKEY setup, retaining the supported key-provision methods, and explaining that ~/.config/mostro is not created automatically.
Out of Scope Changes check	✅ Passed	The pull request changes only the MOSTRO_PUBKEY configuration error message. No unrelated changes are present.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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