add speak detection in om1

[WenjinFu]

1. OM1 — add-speak-detection

Speaker attribution: OM1 knows who is talking

Every turn, OM1 now tells the model which person in view actually spoke —
and when someone says "my name is Sean", the name is saved against that
person, not whoever happens to be most prominent in frame.

How it works

ASR accepts a transcript
  → asr_stream fires POST /speaking {win_start_ms, win_end_ms}   (video-processor, LR-ASD)
  → SpeakerProvider caches the answer
  → runtime waits up to 250ms for it before assembling the prompt
  → prompt: "Speaker: anon_f3b609 (track 73, confidence 0.33) [SPEAKING NOW]"
  → face_memory op:set_name targets that uuid

Changes

File	What
internal/providers/speaker.go	New. Resolves the active speaker over an audio window; async, TTL'd, single-flight
plugins/inputs/asr/asr_stream.go	Starts the resolve on transcript, using the real speech window
internal/providers/face_presence.go	Marks the speaking face in the prompt; files memory against them
plugins/actions/face_memory/face_memory.go	set_name targets the measured speaker (uuid, track_id fallback)
internal/actions/schema.go	BuildSchema honours json:",omitempty"
internal/runtime/runtime.go	Waits for the resolve before prompt assembly; logs tool calls
config/*.json5	Prompt sections: who you're talking to, remembering names

Testing

go build ./... and go test ./... pass — 3 new test files, ~950 lines.
(The 3 pre-existing TestConfigFilesMatchSchema failures are unrelated to
this branch.) Verified end-to-end on a G1: person introduces themselves,
gallery and visualization update to their name, including for someone standing
beside the tracked person.

Depends on

OM1-video-processor: /speaking endpoint + profile-face support in LR-ASD.

[codecov]

Codecov Report

❌ Patch coverage is 81.67939% with 72 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
internal/providers/speaker.go	79.23%	27 Missing and 11 partials ⚠️
plugins/inputs/face_presence.go	0.00%	15 Missing ⚠️
internal/providers/face_presence.go	91.56%	4 Missing and 3 partials ⚠️
plugins/actions/face_memory/face_memory.go	92.63%	5 Missing and 2 partials ⚠️
internal/actions/schema.go	50.00%	2 Missing and 1 partial ⚠️
plugins/inputs/asr/asr_common.go	0.00%	1 Missing ⚠️
plugins/inputs/asr/google_asr.go	50.00%	1 Missing ⚠️

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