Prevent + net the unescaped-quote bug in the durable prompts/pipeline

The escape-ASCII-quote rule previously lived only in ephemeral Agent-call
strings. Bake it into the durable artifacts so the next session doesn't
re-derive it:
- SUBAGENT_PROMPT.md + ENRICHMENT_PROMPT.md: explicit rule to escape any
  ASCII " inside JSON string values (Romanian „cuvânt" is the trap).
- run_enrichment.py collect_enrichment: repair malformed parts with
  escape_stray_quotes instead of dropping them — the enrichment path had no
  repair net (bad parts were silently dropped, losing that activity's
  enrichment). Extraction already had one; now both do.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

scripts/ENRICHMENT_PROMPT.md

@@ -92,6 +92,15 @@ Include only the fields you actually fill. Always include `content_key` and
 `estimated_fields` (use `[]` if nothing was inferred). Output valid JSON only —
 no commentary, no markdown fences in the file itself.
 
+### CRITICAL — escape quotes inside string values
+
+Any ASCII double-quote (`"`, U+0022) inside a string value MUST be escaped as
+`\"`. Your Romanian text is full of `„cuvânt"` — written raw, the closing ASCII
+`"` terminates the JSON string early and the whole file fails to parse (and your
+enrichment for this activity is silently lost). Either keep the typographic
+marks (`„ "`) or escape every literal ASCII `"`. After writing, re-read the file
+and confirm it parses as valid JSON.
+
 ## Report
 
 After writing the file, report in under 30 words: the activity name and which