docs: add PID tracking documentation for awf logs command

[Copilot]

Documents the --with-pid flag added in PR #132 for correlating network requests to processes.

Changes

• docs/usage.md: New "PID/Process Tracking" section with usage, output examples, limitations, and use cases
• docs/logging_quickref.md: Quick reference section with JSON field table and examples
• docs-site CLI reference: Added --with-pid to options table with output format examples

Usage

# Follow logs with PID tracking
awf logs -f --with-pid

# Output:
# [2024-01-01 12:00:00.123] CONNECT api.github.com → 200 (ALLOWED) [curl/7.88.1] <PID:12345 curl>

JSON output includes pid, cmdline, comm, and inode fields for process attribution.

README intentionally unchanged per request.

Original prompt

improve docs on this one: do not modify README #132

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Test Coverage Report

Metric	Coverage	Covered/Total
Lines	81.02%	1230/1518
Statements	80.98%	1261/1557
Functions	78.16%	136/174
Branches	72.56%	410/565

Coverage Thresholds

The project has the following coverage thresholds configured:

• Lines: 38%
• Statements: 38%
• Functions: 35%
• Branches: 30%

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Coverage report generated by `npm run test:coverage`