SESSION-1: register in-flight session fields; move site_id ownership to BRIDGE-1

[JarbasAl]

Consolidates the SESSION-1 §2.1 field-registry edits that were previously bundled as companion edits inside the CONVERSE-1 (#25), FALLBACK-1 (#39), PERSONA-1 (#37), USER-ID-1 (#54) and BRIDGE-1 (#43) feature PRs into a single one-file change to the spec they all amend — per the 1 file, 1 PR rule.

Changes (ovos-session-1.md)

• §2.1 registry — register converse_handlers (CONVERSE-1 §2.1), fallback_handlers (FALLBACK-1 §4), persona_id (PERSONA-1 §3), the identity fields user_id/voice_id/face_id/name_id/passphrase_id/default_user_id (USER-ID-1 §2) and auth_level (integer, USER-ID-1 §3).
• §3.3 site_id — move the full definition to OVOS-BRIDGE-1 §3.4; this section and the registry Owner column become pointers, retaining only the orchestrator-pipeline consumer constraints (opaque, no-overwrite).
• See-also — fix ownership: active_handlers → PIPELINE-1 §7.1, converse_handlers → CONVERSE-1 §2.1; add owners for the new fields.
• Version 1 → 2, add the missing SESSION-1 CHANGELOG section, README index updated.

Compatibility: V1 (backwards-compatible) — every field is OPTIONAL on the wire; a V0/V1 consumer that ignores the new fields is unaffected.

The feature PRs listed above will drop their SESSION-1 edits and forward-reference this PR.

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