feat(ingestion): implement log monitoring script with webhook integration

- Add logwhisperer.sh script for tailing and monitoring system logs
- Implement pattern matching for critical errors (FATAL, ERROR, OOM, segfault)
- Add JSON payload generation with severity levels
- Implement rate limiting and offset tracking per log source
- Add install.sh with interactive configuration and systemd support
- Create comprehensive test suite with pytest
- Add technical specification documentation
- Update CHANGELOG.md following Common Changelog standard

All 12 tests passing. Follows Metodo Sacchi (Safety first, little often, double check).

CHANGELOG.md

@@ -0,0 +1,51 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Common Changelog](https://common-changelog.org/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [0.1.0] - 2026-04-02
+
+### Added
+
+- feat: Implement log ingestion script (`logwhisperer.sh`) for monitoring system logs
+  - Monitor multiple log sources: syslog, nginx, postgresql
+  - Pattern matching for critical errors (FATAL, ERROR, OOM, segfault, disk full)
+  - JSON payload generation with severity levels (low, medium, critical)
+  - Rate limiting to prevent alert flooding (30s per source/pattern)
+  - Offset tracking for each log file to avoid reprocessing
+  - HTTP POST dispatch to configurable webhook with retry logic
+  - Dry-run mode for testing pattern matching without sending webhooks
+  - Configuration file support (`/etc/logwhisperer/config.env`)
+  - Command-line flags: `--help`, `--validate`, `--config`, `--dry-run`, `--test-line`
+
+- feat: Create installation script (`install.sh`)
+  - Interactive configuration wizard
+  - UUID v4 generation for CLIENT_ID
+  - Systemd service creation (when run as root)
+  - Support for both system-wide and user-local installation
+  - Prerequisite checking (bash, curl)
+  - Connectivity test to webhook URL
+
+- test: Add comprehensive test suite (`tests/test_logwhisperer.py`)
+  - Script existence and executable validation
+  - Configuration validation tests
+  - Pattern matching tests (FATAL, OOM, ERROR patterns)
+  - JSON payload structure validation
+  - Severity mapping verification
+
+- docs: Create technical specification for Feature 1 (Log Ingestion)
+  - Architecture diagram and component description
+  - Requirements (functional and non-functional)
+  - Safety guidelines (Metodo Sacchi)
+  - Acceptance criteria
+
+### Security
+
+- Configuration files created with restrictive permissions (600)
+- No hardcoded credentials in scripts
+- HTTPS validation for webhook URLs (warning for non-HTTPS)
+- Read-only access to log files (no modifications)