feat(daemon): classify test vs production files per SonarQube convention

[aksOps]

Adds the test/main code split SonarQube proper supports. Each input file gets an isTest flag based on language-conventional paths; sonarlint-analysis-engine then skips Main-only rules on test files (java:S100 method naming, java:S106 System.out, java:S1118 utility-class ctor, ...). We override no rules — only classify files correctly so the analyzer's own scope metadata does its job.

Verified self-scan result

Metric	Before	After	Delta
Total issues	263	77	−186 (−70%)
java:S100 (method naming)	70	0	all 70 were on test methods
java:S106 (System.out)	13	11 (all main)	tests get a pass
java:S1118 (utility-class ctor)	1	1 (main)	tests untouched

The 70 java:S100 hits the previous self-scan flagged on daemon/src/test/java/... test methods are gone — same code, same rules, same analyzer; the classifier just tells the engine what's a test.

Classification (industry-standard per language)

Language	Patterns
Java / Kotlin	src/test/**, **/*Test.java, **/*Tests.java, **/*IT.java (and .kt)
Scala	src/test/**, **/*Test.scala
Go	**/*_test.go
Python	tests/**, test/**, **/test_*.py, **/*_test.py
JS / TS	tests/**, __tests__/**, **/*.{test,spec}.{js,jsx,ts,tsx}
PHP	tests/**, **/*Test.php
Ruby	spec/**, test/**, **/*_spec.rb, **/*_test.rb
HTML / XML / CSS	no convention → MAIN

Cross-language paths like src/test/, tests/, __tests__/, spec/ count regardless of language.

Agent / skill override

A new global CLI option --test-path GLOB (repeatable) augments the built-in detection for non-standard layouts:

sonar --test-path 'src/integration/**' --test-path 'e2e/**' analyze .

Plumbed through AnalyzeRequest.additionalTestPaths (new field, with a 5-arg backward-compat constructor so existing call sites keep compiling). Standalone runs without an agent fall back to the detector defaults.

Tested

• 21-case unit test on TestPathDetector (cross-language paths, per-language filenames, negatives, Windows backslashes, null/empty edge cases) — all pass.
• Full daemon test suite green.
• Full reactor build (protocol, daemon, cli, dist) green.
• End-to-end self-scan: 263 → 77 issues, 0 java:S100 (verified against a fresh daemon running this branch's code).

🤖 Generated with Claude Code