feat(agents): add reactivate_agent and admin_reactivate_agent

[lesbass]

Add the missing counterpart to deactivate_agent / admin_deactivate_agent, allowing owners to reactivate their paused agents and admins to reactivate any agent.

Changes

• reactivate_agent: sets active = true for an agent, gated to the agent's owner (mirrors deactivate_agent)
• admin_reactivate_agent: sets active = true for any agent, gated to the contract admin (mirrors admin_deactivate_agent)

Both functions preserve the agent's score and payment history — only the active flag is toggled.

Tests added

• test_reactivate_agent_succeeds_for_owner — owner can reactivate their deactivated agent
• test_reactivate_agent_rejects_non_owner — non-owner call panics; agent stays inactive
• test_admin_reactivate_agent_succeeds — admin can reactivate any agent
• test_admin_reactivate_agent_requires_admin — non-admin call panics

Verification

Local test run blocked by missing native build toolchain (cc linker not available). All four new tests follow the exact structure and patterns of the existing deactivate_agent / admin_deactivate_agent tests. CI run will confirm.

Closes #313

Summary by CodeRabbit

• New Features

  • Added owner-authorized agent reactivation.
  • Added administrator-authorized agent reactivation.
  • Reactivated agents now have their active status restored and retention period refreshed.

• Bug Fixes

  • Added authorization checks to prevent unauthorized agent reactivation.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: ccb5fb98-4919-48be-858c-81e4b1a68be6

📥 Commits

Reviewing files that changed from the base of the PR and between 0546692 and f7c45d9.

📒 Files selected for processing (1)

• contract/agents/src/lib.rs

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📝 Walkthrough

Walkthrough

The agents contract now supports owner- and admin-authorized reactivation. Each method authenticates and authorizes the caller, marks the agent active, persists the record, and refreshes its TTL. Tests cover successful and rejected reactivation attempts.

Changes

Agent reactivation

Layer / File(s)	Summary
Owner and admin reactivation methods contract/agents/src/lib.rs	Adds reactivate_agent and admin_reactivate_agent with caller authentication, authorization checks, active-state updates, persistence, and TTL renewal. Tests cover authorized and unauthorized callers.

Estimated code review effort: 2 (Simple) | ~10 minutes

Suggested reviewers: ritik4ever, naninu123, aadviksinghdebug

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the two reactivation methods added by the pull request.
Linked Issues check	✅ Passed	The changes implement owner and admin reactivation, authorization checks, state persistence, TTL refresh, and related tests for issue #313.
Out of Scope Changes check	✅ Passed	The changes remain within issue #313 and support agent reactivation and authorization requirements.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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