feat(runtime): add delivery profile presets

[Lythaeon]

Description

Adds runtime delivery profiles as a typed runtime-level policy for SOF-owned downstream delivery defaults. This implements the Rust runtime side of ADR-0013 after the docs branch was merged to main.

The feature makes the default downstream delivery posture explicit while preserving bounded ingest and keeping caller-supplied plugin/extension hosts untouched.

Changes

Detailed list of what changed:

• crates/sof-observer/src/runtime.rs: added RuntimeDeliveryProfileSettings, profile-to-builder helpers, ObserverRuntime::with_runtime_delivery_profile, setup defaults, regression tests, and ignored soak/benchmark fixtures.
• crates/sof-observer/src/app/config/base.rs: added SOF_RUNTIME_DELIVERY_PROFILE parsing with explicit warning fallback for unknown env values.
• crates/sof-observer/src/app/runtime/entrypoints.rs: applies the selected profile to SOF-owned default plugin and extension hosts.
• docs/architecture/adr/0013-runtime-delivery-profiles.md: documents the implemented profile table and manual soak/benchmark commands.
• docs/gitbook/operations/knob-registry.md and docs/operations/advanced-env.md: document the new env knob.

For slice-related changes, include:

• Affected slices: observer runtime configuration, runtime entrypoints, plugin dispatch defaults, runtime-extension dispatch defaults, derived-state replay env-backed defaults.
• Cross-slice communication changes (if any) and why: no new runtime cross-slice dependency; profile application lives at the runtime composition boundary and uses existing framework builders.
• Migration requirements (if any): none. Default remains latency_optimized and explicit caller-supplied hosts preserve their existing configuration.

Motivation

Business motivation: make SOF easier to operate across latency-sensitive, balanced, and stateful/analytics-style consumers without exposing a bag of low-level toggles.

Technical motivation: replace implicit downstream runtime bias with one typed, testable policy bundle while preserving bounded queues and explicit runtime ownership.

Alternative approaches considered: keeping only env knobs, exposing per-hook/per-plugin queue policy, or claiming lossless delivery. These are intentionally avoided per ADR-0013.

Scope and impact

• Affected slices: sof runtime API, runtime env config, app runtime entrypoints, runtime docs.
• Data/API changes: adds RuntimeDeliveryProfile application helpers and ObserverRuntime::with_runtime_delivery_profile; adds SOF_RUNTIME_DELIVERY_PROFILE values latency_optimized, balanced, delivery_disciplined.
• Backward compatibility: default behavior remains latency optimized; unknown env values warn and fall back to default; explicitly supplied plugin/extension hosts are preserved.
• Performance impact: profile selection happens during setup/default host construction, not per event. Larger queues and stricter delivery-disciplined transaction worker settings are opt-in.
• Security impact: no new network or trust boundary; no unbounded queues introduced.

Testing

• Unit tests
• Integration tests
• Manual verification
• Performance checks (if applicable)
• Security checks (if applicable)

Commands/results:

cargo fmt --all
cargo test -p sof runtime_delivery_profile --lib
cargo test -p sof observer_runtime_profile --lib
SOF_PROFILE_ITERATIONS=1024 cargo test -p sof runtime_delivery_profile_plugin_dataset_dispatch_profile_fixture --lib -- --ignored --nocapture
SOF_PROFILE_ITERATIONS=1024 cargo test -p sof runtime_delivery_profile_transaction_dispatch_profile_fixture --lib -- --ignored --nocapture
SOF_PROFILE_ITERATIONS=1024 cargo test -p sof runtime_delivery_profile_extension_dispatch_profile_fixture --lib -- --ignored --nocapture
cargo test -p sof --lib
cargo clippy -p sof --lib --all-features -- -D warnings

Results:

runtime_delivery_profile_* focused tests: passed
ignored soak/benchmark fixtures at SOF_PROFILE_ITERATIONS=1024: passed
cargo test -p sof --lib: 265 passed, 38 ignored
cargo clippy -p sof --lib --all-features -- -D warnings: passed

Related issues and documentation

• Fixes:
• Related: ADR-0013 runtime delivery profiles; ARD-0010 simplification without capability regression.
• Architecture docs: docs/architecture/README.md
• Relevant ARD/ADR: docs/architecture/adr/0013-runtime-delivery-profiles.md, docs/architecture/ard/0010-simplification-without-capability-regression.md
• Operations/runbook updates: docs/gitbook/operations/knob-registry.md, docs/operations/advanced-env.md

Reviewer checklist

• Code follows project standards and architecture constraints
• Slice boundaries are respected (docs/architecture/ard/0003-slice-dependency-contracts.md)
• Tests added/updated and passing
• Documentation updated (README/docs/operations as needed)
• No undocumented breaking change
• Performance trade-offs documented where relevant
• Security considerations addressed where relevant

Additional notes

This PR is based directly on the merged main that already contains the docs/runtime-profile-spec work. TS/Python SDK enum exposure remains future follow-up work from ADR-0013 and is not implemented here.