fix: parser accepts bracketless format, rejects project snapshots, adds durable-content prompt

P0a: Parser now accepts both - [type] text and - type text formats
P0b: Prompt adds durable-content guidance to avoid session-specific snapshots
P0c: Parser quality gate rejects exact test counts, file counts, phase progress
- Only rejects phase progress when it appears early in the string (snapshot)
- Stable config values with numbers (Admin PIN, Scrypt) still pass
- Adds 7 new tests covering bracketless parsing and snapshot rejection

src/plugin.ts

@@ -89,8 +89,13 @@ function buildCompactionPrompt(privateContext: string): string {
     "",
     "## Relevant Files",
     "",
-    "At the end of the summary, extract durable memory entries for future",
-    "sessions using these labels:",
+    "At the end of the summary, extract durable memory entries for future sessions.",
+    "Only extract facts that are likely to stay true across sessions.",
+    "Do not extract session-specific progress like exact test counts, file counts, or phase numbers.",
+    "For progress, extract the stable goal or durable milestone, not the current number.",
+    "For references, extract configuration values that do not usually change between sessions.",
+    "For feedback, extract unresolved issues or user preferences that future sessions need to know.",
+    "Use exactly this candidate format, including square brackets around the type:",
     "",
     "Memory candidates:",
     "- [feedback] content",
@@ -98,6 +103,8 @@ function buildCompactionPrompt(privateContext: string): string {
     "- [decision] content",
     "- [reference] content",
     "",
+    "Do not write '- project content'; write '- [project] content'.",
+    "",
     "Background context, use this to inform the summary above.",
     "Do not output this context verbatim:",
     "",