feat(schema): implement D-035 converged tag taxonomy as canonical JSON Schema (#168)

- Add content/_schema/dialogue-line.schema.json — canonical standalone line schema
  with all 6 structural + 3 selection + 2 authoring-only tags and $defs for
  monologue extension (character, trigger, prerequisite)
- Update dialogue-pool.schema.json: add dual_lens and notes authoring-only tags,
  add additionalProperties: false to knowledge_grant
- Update monologue-pool.schema.json: add all 6 structural tags as required fields
  for schema compliance (role=player_character, access=[public], trust=surface are
  constrained constants); add topic, mood, dual_lens, notes
- Enumerate all 14 v0.1 situations and 9 v0.1 topics as allowed enum values per D-035
- Fix Rust sync gap: add Situation::Greeting and Mood::Focused to line_pool.rs
  (D-035 Sprint 8 amendments — were in schema but missing from Rust enums, causing
  content with these values to be silently dropped at runtime)
- Update line_preview.rs situation_str, mood_str match arms and help text for
  new variants; all 25 line_pool tests pass

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

server/src/bin/line_preview.rs

@@ -348,7 +348,7 @@ fn run_dialogue(index: &LinePoolIndex, args: &Args) {
                     "situation",
                     "arrival, shift_start, shift_end, shift_transition, bar_evening, \
                      night_shift, investigation, confrontation, social, alone, \
-                     emergency, routine, observation",
+                     emergency, routine, observation, greeting",
                 )
             })
             .collect()
@@ -596,6 +596,7 @@ fn situation_str(s: &Situation) -> &'static str {
         Situation::Emergency => "emergency",
         Situation::Routine => "routine",
         Situation::Observation => "observation",
+        Situation::Greeting => "greeting",
     }
 }
 
@@ -637,5 +638,6 @@ fn mood_str(m: &Mood) -> &'static str {
         Mood::Conflicted => "conflicted",
         Mood::Concerned => "concerned",
         Mood::Relieved => "relieved",
+        Mood::Focused => "focused",
     }
 }

server/src/content/line_pool.rs

@@ -79,6 +79,9 @@ impl FromStr for TrustTier {
 }
 
 /// D-028 Layer 2: Situation context — when this line can fire.
+///
+/// 14 v0.1 values: 13 original + Greeting added Sprint 8 (D-035 amendment)
+/// for PC dialogue pools initial contact lines.
 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub enum Situation {
     Arrival,
@@ -94,6 +97,8 @@ pub enum Situation {
     Emergency,
     Routine,
     Observation,
+    /// Added Sprint 8 (D-035 amendment): PC dialogue initial contact lines.
+    Greeting,
 }
 
 impl FromStr for Situation {
@@ -113,6 +118,7 @@ impl FromStr for Situation {
             "emergency" => Ok(Self::Emergency),
             "routine" => Ok(Self::Routine),
             "observation" => Ok(Self::Observation),
+            "greeting" => Ok(Self::Greeting),
             _ => Err(ParseEnumError {
                 kind: "Situation",
                 value: s.to_string(),
@@ -157,6 +163,9 @@ impl FromStr for Topic {
 }
 
 /// D-028 Layer 4: Mood tag — influences weighted selection.
+///
+/// 9 v0.1 values: 8 original + Focused added Sprint 8 (D-035 amendment)
+/// for Kael dialogue at The Terminal and maintenance corridors.
 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub enum Mood {
     Fond,
@@ -167,6 +176,8 @@ pub enum Mood {
     Conflicted,
     Concerned,
     Relieved,
+    /// Added Sprint 8 (D-035 amendment): Kael dialogue at Terminal/corridors.
+    Focused,
 }
 
 impl FromStr for Mood {
@@ -181,6 +192,7 @@ impl FromStr for Mood {
             "conflicted" => Ok(Self::Conflicted),
             "concerned" => Ok(Self::Concerned),
             "relieved" => Ok(Self::Relieved),
+            "focused" => Ok(Self::Focused),
             _ => Err(ParseEnumError {
                 kind: "Mood",
                 value: s.to_string(),
@@ -664,6 +676,7 @@ mod tests {
             "emergency",
             "routine",
             "observation",
+            "greeting", // Sprint 8 amendment (D-035)
         ];
         for v in values {
             assert!(
@@ -704,6 +717,7 @@ mod tests {
             "conflicted",
             "concerned",
             "relieved",
+            "focused", // Sprint 8 amendment (D-035)
         ];
         for v in values {
             assert!(v.parse::<Mood>().is_ok(), "Failed to parse mood: {}", v);