spec: session-1.md — register user-preference fields; one-purpose-per-field language taxonomy

[JarbasAl]

Refines OVOS-SESSION-1 to Version 2.

• §3.5 (new): registers location (object), system_unit, time_format, date_format (strings) — the session origin's presentation preferences, defaulting per §2.1, wire-weight rule §3.4 applies. Same section deliberately declines to register is_speaking / is_recording: instant device state snapshotted into a propagating session is stale on read; implementations MUST NOT rely on it — OVOS-AUDIO-1 lifecycle signals are authoritative.
• §3.2: the six language fields get a one-purpose-per-field summary table, split into stable preference signals (lang, secondary_langs, output_lang) vs per-utterance observation signals (stt_lang, request_lang, detected_lang); disagreement between the two groups is signal, not error. All six kept — each records a distinct fact no other field carries. Stale "all four" count fixed.
• §3.1: remote participants SHOULD use a distinct session_id; remote "default" SHOULD be gated behind an elevated-privilege grant in layer-2 systems.
• §3.2.5: wake-word-derived request_lang cites its observable source ovos.listener.wakeword (AUDIO-IN-1 §6.5).
• §3.4: notes the SESSION-2 §3.2 thin-session allowance.
• §4.1: materialization citation corrected to MSG-1 §5.1–§5.2; phantom quotation dropped.
• CHANGELOG entry + Version bump to 2.

Note: the §3.2.5 citation depends on the AUDIO-IN-1 §6.5 ovos.listener.wakeword signal landing in its companion PR.

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