[v0.1.0] CLI: Support fetching issue directly from GitHub

[Kavirubc]

Problem Statement
Currently the process command requires a local JSON file path via --issue. Users should be able to process an existing GitHub issue by ID.

Proposed Solution
Support --repo owner/name --number 123 flags in process.go.
If these flags are present, fetch the issue using the GitHub client before starting the pipeline.

Feature Scope
CLI

[Kavirubc]

🤖 Simili Triage Report

Quality Assessment

Score: 8.5/10 (Good)

• ✅ Issue is well-described

Suggested Labels

enhancement, CLI

Transfer Suggestion

🔄 Transferred from similigh/event-integrator-sdk (95% confidence)
Reason: The issue is about adding a CLI feature. The documentation for this repository explicitly describes the CLI and its features, making this a very strong match.

If this transfer was incorrect, comment /undo to move it back.

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