[P0] Add a model and capability manifest to every report

[deucebucket]

Problem

DeckDoc cannot safely interpret missing paths, driver names, thresholds, or model-specific remediations until it knows the Deck family and which evidence sources are actually supported. Jupiter LCD, Galileo OLED, SteamOS versions, Windows, rescue environments, replacement parts, and kernel exports differ.

Shipped baseline — v3.4.0 / #28

• schema-v1 machine-readable JSON plus a human-readable module runs before other findings;
• Jupiter LCD, Galileo OLED, unknown/non-Valve, and inaccessible-evidence fixtures;
• explicit supported_and_readable, supported_but_inaccessible, absent, not_applicable, and unknown states;
• dynamic DRM, internal display, LCD backlight, battery, primary storage, and Wi-Fi handoff to initial consumers;
• allowlisted model facts only—no serial or network identity;
• live Jupiter/Galileo validation.

Remaining scope

Expand the schema and consumers across:

• BIOS, kernel, SteamOS build/slot, client channel, session type, Windows, and Rescue environment semantics;
• APU/GPU, wireless, audio, storage, panel/backlight, Type-C/PD, fan/hwmon, input, and replacement-part capabilities;
• every module that still performs legacy path discovery;
• backward-compatible schema migration tests beyond schema v1.

Acceptance criteria

• One normalized manifest is emitted before module findings.
• All modules consume capabilities instead of assuming paths such as card0, BAT1, wlan0, or /dev/nvme0n1.
• LCD-only checks are explicitly not-applicable on OLED rather than reported missing.
• Windows and Rescue reports clearly mark SteamOS-only evidence unavailable.
• Mock fixtures cover Jupiter LCD, Galileo OLED, unknown hardware, and inaccessible sysfs.
• Schema versioning and current schema limitations are documented.
• Schema migration/backward-compatibility fixtures exist when schema v2 is introduced.

Decision boundary

A missing export is a coverage fact, not evidence that hardware is healthy or failed.

Source

See docs/research/steamdeck-issue-deep-dive.md, docs/wiki/Coverage-and-Gaps.md, and merged PR #28.