Fix 656 lazy temporal answers: replace 'static historical fact' with source-attributed answers

- Updated perspective.md: require source citations in temporal answers
- Filed feature request #75 for BCE temporal tag support (tested 7 formats, all rejected)
- Built batch script to replace all 'Static historical fact' answers with proper
  source attribution (ancient text date + modern publication year)
- Fixed source date detection bug (modern books about ancient figures)
- Answers now cite attesting source and its date per document footnotes

battles/battle-of-actium.md

@@ -21,7 +21,7 @@ The Battle of Actium (31 BCE) was the decisive naval engagement in which Octavia
 
 ## Aftermath
 - Antony and Cleopatra committed suicide in Alexandria (30 BCE)
-- Egypt became a Roman province
+- Egypt became a Roman province (30 BCE)
 - Octavian became sole ruler; Senate granted him the title Augustus (27 BCE) [^2]
 
 ---
@@ -33,29 +33,29 @@ The Battle of Actium (31 BCE) was the decisive naval engagement in which Octavia
 
 <!-- factbase:review -->
 - [x] `@q[temporal]` Line 10: "Date: 2 September 31 BCE" - when was this true?
-> Static historical fact. The battle occurred on 2 September 31 BCE. No temporal tag needed — this is a fixed event date already stated in the text.
+> BCE event. Attested by Plutarch, *Life of Antony* (~75 CE) [^1]; modern scholarly confirmation in Lange (2022) [^2].
 - [x] `@q[temporal]` Line 11: "Location: Ionian Sea, near Actium (western Greece)" - when was this true?
-> Static historical fact. The battle location is a fixed geographical/historical fact. No temporal tag needed.
+> BCE-era fact. Attested by Plutarch, *Life of Antony* (~75 CE) [^1]; confirmed in Lange (2022) [^2].
 - [x] `@q[temporal]` Line 12: "Belligerents: Octavian vs. Mark Antony and Cleopatra VII" - when was this true?
-> Static historical fact. The belligerents at Actium are fixed. No temporal tag needed.
+> BCE-era fact. Attested by Plutarch, *Life of Antony* (~75 CE) [^1].
 - [x] `@q[temporal]` Line 13: "Commanders: Agrippa (for Octavian), Antony and Cleopatra" - when was this true?
-> Static historical fact. The commanders at Actium are fixed. No temporal tag needed.
+> BCE-era fact. Attested by Plutarch, *Life of Antony* (~75 CE) [^1]. Agrippa's role confirmed in Cassius Dio, *Roman History* 50 (~229 CE).
 - [x] `@q[temporal]` Line 14: "Result: Decisive victory for Octavian [^1]" - when was this true?
-> Static historical fact. The battle result is fixed. No temporal tag needed.
+> BCE-era fact. Attested by Plutarch, *Life of Antony* (~75 CE) [^1]; modern analysis in Lange (2022) [^2].
 - [x] `@q[temporal]` Line 17: "Octavian's fleet: ~400 ships; Antony's fleet: ~230 warships + 60 Egyptian ships" - when was this true?
-> Static historical fact. Fleet sizes at the battle are fixed estimates. No temporal tag needed. Source: Plutarch, Life of Antony; Lange (2022).
+> BCE-era fact. Fleet estimates from Plutarch, *Life of Antony* (~75 CE) [^1]; modern analysis in Lange (2022) [^2]. Ancient estimates vary by source.
 - [x] `@q[temporal]` Line 18: "Antony's forces were weakened by desertion and disease during a prolonged blo..." - when was this true?
-> Static historical fact. Events during the 31 BCE campaign. No temporal tag needed.
+> BCE event (31 BCE campaign). Attested by Plutarch, *Life of Antony* (~75 CE) [^1]; Cassius Dio, *Roman History* 50 (~229 CE).
 - [x] `@q[temporal]` Line 19: "Cleopatra's squadron broke through and fled; Antony followed" - when was this true?
-> Static historical fact. Event during the battle of 2 September 31 BCE. No temporal tag needed.
+> BCE event (2 September 31 BCE). Attested by Plutarch, *Life of Antony* 66 (~75 CE) [^1].
 - [x] `@q[temporal]` Line 20: "Remaining fleet surrendered; Antony's legions defected to Octavian" - when was this true?
-> Static historical fact. Event during/after the battle of 31 BCE. No temporal tag needed.
+> BCE event (31 BCE). Attested by Plutarch, *Life of Antony* (~75 CE) [^1]; Cassius Dio, *Roman History* 51 (~229 CE).
 - [x] `@q[temporal]` Line 23: "Antony and Cleopatra committed suicide in Alexandria (30 BCE)" - when was this true?
-> Static historical fact. Occurred 30 BCE. No temporal tag needed — date is already in the text.
+> BCE event (30 BCE). Attested by Plutarch, *Life of Antony* 76-86 (~75 CE) [^1].
 - [x] `@q[temporal]` Line 24: "Egypt became a Roman province" - when was this true?
-> Static historical fact. Egypt became a Roman province in 30 BCE after the deaths of Antony and Cleopatra. Add '(30 BCE)' to the text for clarity.
+> BCE event (30 BCE). Attested by Cassius Dio, *Roman History* 51.17 (~229 CE); confirmed in Lange (2022) [^2].
 - [x] `@q[temporal]` Line 25: "Octavian became sole ruler; Senate granted him the title Augustus (27 BCE) [^2]" - when was this true?
-> Static historical fact. Occurred 27 BCE, already stated in the text. No temporal tag needed.
+> BCE event (27 BCE). Attested by multiple ancient sources including Cassius Dio (~229 CE); modern confirmation in Lange (2022) [^2].
 - [x] `@q[missing]` Line 10: "Date: 2 September 31 BCE" - what is the source?
 > Source: Plutarch, Life of Antony; Cassius Dio, Roman History 50-51. The date is well-established in classical sources. Already cited via [^1] (Plutarch) and [^2] (Lange 2022).
 - [x] `@q[missing]` Line 11: "Location: Ionian Sea, near Actium (western Greece)" - what is the source?