Deep inspection: Document implementation gaps and critical build bug

[Copilot]

Problem

Analyze all stub/TODO code, verify working vs non-working implementation, and compare against claimed functionality.

Findings

Critical Build Bug 🔴

src/libkadence/CMakeLists.txt excludes session_analyzer.cpp and time_utils.cpp - 98 lines of production-ready code exists but isn't compiled.

# Current (broken)
add_library(kadence_core STATIC
    kadence_core.cpp  # empty stub
)

# Should be
add_library(kadence_core STATIC
    kadence_core.cpp
    session_analyzer.cpp  # 76 lines, fully implemented
    time_utils.cpp        # 22 lines, fully implemented
)

Implementation Status

Working (30%):

• SessionAnalyzer: avg/percentile FPS computation, dropped frame detection, buffer management
• Time utilities: monotonic clock, ns/ms conversions
• Data structures: FrameSample, Session, SessionStats
• Modern C++20 design

Stubs (4 instances):

• kadenced.cpp: prints "stub", exits immediately
• Main.qml: shows "Kadence UI stub"
• Overlay.qml: shows "Overlay stub"
• kadence_core.cpp: empty placeholder function

Missing (70%):

• Frame capture (compositor hooks / GL interception)
• Process monitoring
• IPC layer (D-Bus / sockets)
• All daemon/UI/overlay application logic

TODO/FIXME comments: None found

Documentation Delivered

Five analysis documents (1,954 lines, 63KB):

• INSPECTION_REPORT.md - Executive summary with statistics
• ANALYSIS.md - Component breakdown, 5-phase plan (10-13 day estimate)
• STATUS.md - Status matrix, critical issues, priorities
• ARCHITECTURE.md - Current vs required architecture diagrams
• QUICKFIX.md - 30-second fix for build bug

Gap Analysis

README claims "Low-latency Gaming frame pacing analyzer" but:

• ✅ Analysis algorithm complete
• ❌ No frame capture mechanism
• ❌ No gaming integration
• ❌ No functional UI/overlay

Reality: Solid foundation (data structures + algorithm) but all application-level code is stubs.

Changes

• Add .gitignore for build artifacts
• Add comprehensive gap analysis across 5 documentation files
• Add phased implementation roadmap with effort estimates

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