fix: validate compact config log retention range

[SlaVKsVolks]

Fixes PlatformNetwork/bounty-challenge#53235.

Changes:

• Documents the accepted compact config log retention range as 1-3650 days.
• Adds clap validation so zero and out-of-range values are rejected before config handling.
• Adds parser tests for the upper bound and zero rejection.

Verification:

• rustfmt --edition 2024 --check src/cortex-cli/src/compact_cmd.rs
• cargo check -p cortex-cli
• git diff --check

Note: targeted cargo test for compact_cmd currently fails before reaching these tests because src/cortex-cli/src/agent_cmd/tests.rs imports private read_file_with_encoding on origin/main.

[greptile-apps]

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