Add logquill CLI tail command

[nikhilvdev]

This change adds a logquill console script for tailing JSONL log files in local development. The new CLI supports tail with level filtering, raw JSON output, last-N record limiting, and follow mode for polling appended lines. Malformed or non-object JSON lines are skipped with warnings instead of crashing the tail. It also updates the README and changelog and registers the console entry point in pyproject.toml.

Summary

Checklist

• ruff check . passes
• mypy logquill passes (--strict on the public API)
• pytest passes, and new surface area has test coverage
• Public API additions are documented in README.md with a runnable example
• CHANGELOG.md has an entry under Unreleased
• If this touches the cross-language contract (levels, logger methods,
  record shape, transport/plugin contracts, config shape) shared with
  logquill-js, a matching tracking issue/PR is opened there

Scope