feat: overhaul session documentation, PSA notes, and client communications

- Reformat PSA resolution/escalation notes: clean single-line header,
  steps with engineer responses inline, remove duplicate timing blocks,
  remove AI confidence section, add follow-up recommendations
- Standardize time display to decimal hours (e.g. 0.25 hrs) across all
  note formatters and status update context
- Add follow_up_recommendations to SessionDocumentation schema and
  surface in SessionDocView; extracted from resolution suggestion steps
- Add _build_what_we_know() helper: uses session.evidence_items when
  cockpit branch merges, falls back to deriving findings from steps
- Fix option label lookup in generate_status_update (was passing raw
  machine values to AI instead of human-readable labels)
- Add 'What We Know' section to status update ticket notes prompt
- Improve _build_session_context in resolution_output_generator to
  include intake text and full step details instead of truncated chat
- Add request_info audience type: client-facing information request
  that skips the length step and generates a numbered question list
- Improve client_update and email_draft prompts with per-context
  guidance (status/resolution/escalation) and fix escalation subject
  line from 'Specialist Review' to 'Specialist Assistance'

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/schemas/ai_session.py

@@ -127,6 +127,7 @@ class SessionDocumentation(BaseModel):
     diagnostic_steps: list[DocumentationStep]
     resolution_summary: str | None = None
     escalation_reason: str | None = None
+    follow_up_recommendations: list[str] = []
     total_steps: int
     duration_display: str | None = None
     generated_at: datetime
@@ -146,7 +147,7 @@ class StatusUpdateRequest(BaseModel):
     """Generate a mid-session or post-session status update."""
     audience: str = Field(
         ...,
-        pattern="^(ticket_notes|client_update|email_draft)$",
+        pattern="^(ticket_notes|client_update|email_draft|request_info)$",
         description="Who is this update for?",
     )
     length: str = Field(