Add performance evidence lab PoC

[reiase]

What changed

• add immutable evidence catalog and GEMM curve-comparison derived views
• add a read-only Performance Evidence mode to the NiceGUI workbench
• catalog the pinned Vidur Phi-2/A100 profile and show operation coverage
• compare exact Vidur GEMM samples with analytical roofline results over identical FLOPs/bytes
• expose query digests, raw record IDs, sample counts, bottlenecks, and model residuals
• package only the pinned manifest/license/profile slice in the base wheel
• render the four workbench modes as a stable 2×2 grid without tab overflow or stray indicators

Boundary

Measured data is shown as exact scatter points and does not claim interpolation. The analytical series is a compute/memory roofline, not an event-level simulation. The PoC compares four GEMM semantics because their selectors can reconstruct exact M/N/K workload facts; attention remains visible in the coverage catalog without a fabricated analytical formula.

Validation

• full test suite: 150 passed
• focused evidence/UI suite after layout fix: 16 passed
• Ruff on active analysis/workbench/tests: passed
• bilingual documentation check: 31 pairs passed
• mkdocs build --strict: passed
• base wheel contract: passed, including only the approved 16 KB Vidur slice
• git diff --check: passed

Visual QA note

The original four-tab horizontal layout overflowed in the 288 px sidebar. It now uses a 2×2 grid and explicitly disables Quasar scroll arrows and the native moving indicator. Automated NiceGUI component tests cover all four modes; the in-app browser connection was unavailable for an additional screenshot pass.