log: focus finite-page Tiger Lake capture on GPU bring-up and failures

[t4ce]

Focus the existing log_os policy for the laptop diagnostic

The first LastAP/MicroFont capture reached SCREEN FULL with USB controller and Render/Info font-tessel output, while the default Gfx/Gpgpu policies suppressed useful initialization/admission records. This PR changes the acceptance profile, not the logger or the driver.

src/log_os.rs::flags::TGL_GPU_DIAG_PROFILE_ENABLED = true selects:

Semantic area	Effective policy
Gfx, Gpgpu	Up(Info)
Render, Boot, Service	Up(Once)
All other areas	Up(Warn)

This preserves every area's Error/Important/Warn; keeps Intel claim/cache/PAT, GuC firmware/bootstrap/admission, panel/plane-stack and GPGPU setup evidence; filters unrelated informational traffic and Render/Info per-stage/poll/retry dumps. No Debug/Trace is enabled. Up(Once) uses the existing severity order; it is not a new rate limiter.

The switch has explicit precedence over the other diagnostic profiles. It is compile-time and build-wide, not a runtime PCI filter. Setting it false restores all pre-existing profile settings. A Boot/Important log-profile=tgl-gpu-first-v1 banner identifies the chosen policy in the mirrored transcript.

Unchanged: TCP formatting and 256 KiB ring, UART routing, LastAP placement, MicroFont task, page-full behavior, UI4/Spirit, shaders and all hardware execution/readiness gates. No new queue, screen filter, sampling framework, or driver instrumentation.

The policy does intentionally filter Render/Info boot summaries too; GuC bootstrap/admission is retained in Gfx/Info. UI4 maps to Global and retains warnings/errors without enabling its per-frame Trace stream. Repeated warnings/errors can still fill a finite page; they are not suppressed or falsely promised to fit.

Only 25 added runtime lines in src/log_os.rs. The other files document the profile and test it.

Validation — passed

Read-only CI succeeded on head 78b8e87cb030dba40d0dd4c95fd83b55b32819a0:
https://github.com/t4ce/TRUEOS/actions/runs/35307226612/job/105481788907

Four compiled Rust tests passed in each of three configurations (12 test runs total): profile enabled, disabled/baseline, and enabled with every competing diagnostic switch also enabled. Tests compile the actual production flags, actual TcpLogSink/EmulatorUartLogSink adapters and shared log-os router, with only physical writes replaced by collectors. They cover all 16 areas × 7 levels, real target-to-area classification, retention of severe records, sink agreement, fallback restoration, and profile precedence.

tools/trueos-doc topic logs returned successfully. rustfmt --emit stdout parsed src/log_os.rs successfully without modifying it. Reviewed the runtime commit diff: only the profile switch, central area-policy override and banner were added.

This is not a full kernel build or laptop boot. No changes to true and no rig reset/deployment.

[coderabbitai]

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