Auto-detect noisy app directories at startup

[CalebisGross]

Summary

• Scans ~/.config/ and ~/.local/share/ (Linux) or ~/Library/ (macOS) for known noisy apps
• Adds detected apps as watcher exclusions before the filesystem watcher starts
• Deduplicates against existing config exclusions so patterns don't stack
• Registry of ~30 known noisy apps: browsers, editors/IDEs, communication apps, desktop environments, audio systems, package managers, cloud sync

Example output on this Linux machine

auto-detected noisy app path=~/.config/google-chrome pattern=.config/google-chrome/ description="Chrome browser storage"
auto-detected noisy app path=~/.config/Code pattern=.config/Code/ description="VS Code internal state"
auto-detected noisy app path=~/.config/Signal pattern=.config/Signal/ description="Signal messenger state"
auto-detect complete exclusions_found=10

How it works

DetectNoisyApps() runs at startup in main.go before NewFilesystemWatcher() is called. It does a fast os.Stat() check for each known app directory — no filesystem walking, no I/O beyond stat calls. Detected patterns are merged with config exclusions, then passed to the watcher constructor.

Files

• internal/watcher/filesystem/autodetect.go — registry + detection logic
• internal/watcher/filesystem/autodetect_test.go — 3 tests (pattern format, real detection, dedup)
• cmd/mnemonic/main.go — hook detection into watcher startup

Test plan

• make build passes
• make check (fmt + vet) passes
• make test — all tests pass, including 3 new autodetect tests
• Test detected 10 noisy apps on this Linux machine (Chrome, Chromium, VS Code, Signal, VLC, dconf, PulseAudio, Docker Desktop, gnome-shell)
• Verify on macOS (scans ~/Library/Application Support/ and ~/Library/Caches/)

Related

• Closes Auto-detect noisy app directories at first startup #27
• Tier 2 of 3-tier noise suppression: (1) static defaults (PR Add Linux desktop app exclusions to watcher config #26, merged), (2) auto-detect (this PR), (3) adaptive learning (Adaptive watcher exclusions: learn from repeated heuristic rejections #28)

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