docs: update changelog and add v0.4.1 release notes

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: vinnytherobot

CHANGELOG.md

@@ -5,6 +5,25 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.4.1] - 2026-04-05
+
+### Added
+
+- `--min-level` threshold filter to show logs at or above a specified level
+- Python 3.9-3.12 CI matrix testing
+- Coverage threshold configuration (`fail_under = 70`)
+- Pre-commit hooks with ruff-format
+- Improved timestamp parsing supporting:
+  - ISO 8601 with various timezone formats
+  - Common Log Format (Apache)
+  - Syslog-style timestamps
+  - Unix timestamps
+
+### Documentation
+
+- Removed references to non-existent `--pulse` flag in documentation
+- Updated issue templates to reference existing `--dashboard` functionality
+
 ## [0.3.1] - 2026-04-04
 
 ### Fixed

RELEASE_NOTES_v0.4.1.md

@@ -0,0 +1,96 @@
+# LogScope v0.4.1 Release Notes
+
+## Overview
+
+LogScope v0.4.1 introduces the **`--min-level` threshold filter**, expanded CI testing across Python versions, improved timestamp parsing, and new development tooling. This release enhances log analysis flexibility with better level filtering and broader platform support.
+
+---
+
+## New Features
+
+### 📊 Minimum Level Threshold Filter (`--min-level`, `-m`)
+
+Filter logs to show only entries at or above a specified severity level.
+
+**Usage:**
+```bash
+# Show WARN and above (WARN, ERROR, CRITICAL, ALERT, FATAL)
+logscope app.log --min-level WARN
+
+# Combined with other filters
+logscope production.log --min-level ERROR --search "database"
+
+# Dashboard mode with threshold
+logscope app.log --dashboard --follow --min-level ERROR
+```
+
+**Level hierarchy:** TRACE < DEBUG < INFO < NOTICE < WARN < ERROR < CRITICAL < ALERT < FATAL
+
+---
+
+## CLI Changes
+
+### New Options
+
+| Option | Short | Default | Description |
+|--------|-------|---------|-------------|
+| `--min-level` | `-m` | `None` | Show logs at or above this level threshold |
+
+### Updated Commands
+
+The min-level filter works in both standard and dashboard modes:
+
+```bash
+# Standard streaming output
+logscope app.log --min-level WARN
+
+# Dashboard mode
+logscope app.log --dashboard --follow --min-level ERROR
+```
+
+---
+
+## Improved Timestamp Parsing
+
+LogScope now recognizes additional timestamp formats:
+
+- **ISO 8601**: `2026-03-21T10:00:00Z`, `2026-03-21T10:00:00.123+02:00`
+- **Common Log Format**: `21/Mar/2026:10:00:00 +0000`
+- **Syslog-style**: `Mar 21 10:00:00`
+- **Unix timestamp**: `1711054800`
+
+---
+
+## CI/CD Improvements
+
+### Python Version Matrix
+
+Tests now run across Python 3.9, 3.10, 3.11, and 3.12:
+
+```yaml
+python-version: ['3.9', '3.10', '3.11', '3.12']
+```
+
+### Development Tooling
+
+- Added coverage threshold (`fail_under = 70`) to prevent regression
+- Added ruff-format pre-commit hook for consistent code style
+
+---
+
+## Bug Fixes / Documentation
+
+### Documentation Fixes
+
+- Removed references to non-existent `--pulse` flag from:
+  - `docs/architecture-review.md`
+  - `CONTRIBUTING.md`
+  - Issue templates
+
+---
+
+## Version Information
+
+- **Version:** 0.4.1
+- **Previous Version:** 0.3.1
+- **Release Date:** 2026-04-05