feat(pilot): pydantic schemas for fix outcome patch

Adds FixStatus literal (5 values matching the DB check constraint),
extends SessionSuggestedFixResponse with outcome fields, and introduces
SessionSuggestedFixOutcomeRequest for the PATCH /outcome endpoint coming
in Task 3.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

backend/app/schemas/session_suggested_fix.py

@@ -12,6 +12,17 @@ from pydantic import BaseModel, Field
 
 UserDecision = Literal["one_off", "draft_template", "build_template", "dismissed"]
 
+# "dismissed" here is the outcome dimension — orthogonal to UserDecision's
+# "dismissed" (script-path choice), though the migration backfill aligns
+# them for pre-existing rows.
+FixStatus = Literal[
+    "proposed",
+    "applied_success",
+    "applied_failed",
+    "applied_partial",
+    "dismissed",
+]
+
 
 class SessionSuggestedFixResponse(BaseModel):
     id: UUID
@@ -25,6 +36,12 @@ class SessionSuggestedFixResponse(BaseModel):
     user_decision: UserDecision | None
     superseded_at: datetime | None
     created_at: datetime
+    status: FixStatus
+    applied_at: datetime | None
+    verified_at: datetime | None
+    partial_notes: str | None
+    failure_reason: str | None
+    ai_outcome_proposal: dict[str, Any] | None
 
     model_config = {"from_attributes": True}
 
@@ -71,6 +88,30 @@ class SessionSuggestedFixDecisionResponse(BaseModel):
     )
 
 
+# Subset of FixStatus that the engineer can set via the outcome endpoint —
+# `proposed` is excluded because you can't un-decide a fix back to "proposed".
+FixOutcome = Literal[
+    "applied_success", "applied_failed", "applied_partial", "dismissed"
+]
+
+
+class SessionSuggestedFixOutcomeRequest(BaseModel):
+    """Engineer-reported outcome of applying a suggested fix.
+
+    Writes to session_suggested_fixes.status and companion columns. This is
+    orthogonal to `user_decision` (which records which script-path the
+    engineer took); outcome captures whether the fix actually worked.
+
+    Allowed transitions:
+    - from `proposed`: any of applied_success | applied_failed | applied_partial | dismissed
+    - from `applied_partial`: applied_success | applied_failed  (partial is not terminal)
+    - from any terminal outcome: no change (server returns 409)
+    """
+    outcome: FixOutcome
+    # Required for applied_partial, optional for applied_failed, ignored otherwise.
+    notes: str | None = Field(None, max_length=500)
+
+
 # ── Resolution note preview ────────────────────────────────────────────────
 
 class ResolutionNotePreviewResponse(BaseModel):