Shaders: Slice D — CLI/MCP parity, packaging, docs, tests

[fernandotonon]

Part of #743 (Epic: Shaders). Final slice — parity, packaging, docs, tests. Mirrors the roadmap "Slice X — CLI/MCP parity, docs, tests" convention.

CLI / MCP parity

• CLI: presets flow through cmdMaterial --preset/--list-presets automatically. If a stylized tunable is worth CLI exposure (e.g. --toon-bands, --outline-width), thread it through cmdMaterial → applyStylizedPreset. Keep minimal; most users take defaults.
• MCP: confirm the material-preset tool lists the new names; add optional tunable params mirroring CLI; breadcrumb "ai.tool_call".
• CLI --preset "Toon + Outline" and the MCP tool produce the same material as the GUI.

Packaging (real risk — audit every path)

New shader/material/texture assets must ship in every package or the preset works in dev but ships broken:

• cfg/resources.cfg.in registers the new programs dir (if added).
• macOS .app bundle copy step includes the new media/ files.
• .deb packaging includes them.
• Windows install includes them.
• Docker image includes them.
• Packaging smoke test: run from a packaged build (not the dev tree) and apply a stylized preset.

Tests

• Extend src/MaterialPresetLibrary_test.cpp: each stylized preset applies, creates expected passes/programs, undo restores, reapply idempotent.
• Plus the Slice-A compile harness (src/StylizedShaders_test.cpp).
• Wire any new _test.cpp into the test target in CMakeLists.txt.

Docs

• CLAUDE.md — add stylized preset names to the examples; add a "Stylized Shaders" architecture note next to MaterialPresetLibrary (GLSL-via-.program, the 2-pass outline, and that custom SRS was deliberately avoided).
• README / website CLI reference — update if it enumerates preset names.
• action.yml — only if the preset surface changes the documented command/options (per CLAUDE.md rule).

Acceptance

• All new tests pass on Linux CI; skip gracefully where Ogre is unavailable.
• Stylized presets resolve from a packaged build on all three platforms.
• Docs updated and discoverable.