Freeze Age instability scores and classify authored writing (#64 #65)

docs/LEGACY_INSTABILITY_AUDIT.md

@@ -47,9 +47,11 @@ Assets in the supplied local tree: `assets/mystcraft/textures/blocks/decay_{blac
 
 ## Rivencraft boundary and proposed safety contract
 
-[`WritingGrammar`](../src/main/java/net/dnorberg/rivencraft/writing/WritingGrammar.java) treats `INCOMPLETE` and supported writing defects as warnings. `AgeGenerationPlan.compile()` freezes the original writing, repaired active-page indexes, and a provisional writing-instability score before world generation. #64 still needs a full versioned score breakdown and saved provider/deck choice so reloads do not reroll effects. The plan must not mutate an already-created Age when a data pack changes. Server-side settings may disable execution, but should not rewrite the saved authored score.
+[`WritingGrammar`](../src/main/java/net/dnorberg/rivencraft/writing/WritingGrammar.java) classifies `INCOMPLETE` as seeded completion and supported writing defects as accepted instability. `AgeGenerationPlan.compile()` freezes the original writing, repaired active-page indexes, and a provisional writing-instability score before world generation. #64 now persists a versioned score breakdown; saved provider/deck choice remains future work. The plan must not mutate an already-created Age when a data pack changes. Server-side settings may disable execution, but should not rewrite the saved authored score.
 
-For #65, **eligible-to-become-unstable** means a known, supported page whose semantics and resulting world are still deterministic: repeated/conflicting single-choice pages, an otherwise valid misplaced modifier, and excess supported symbols within the Binder capacity. The initial 0.5.1.0 implementation retains every original page, uses the last single-choice page, sorts active categories, and saves 500 per extra/conflicting choice or 100 per misplaced page. These are provisional Rivencraft values, not a full port of every `IAgeSymbol.instabilityModifier`. Missing branches remain completion warnings; legal repeated feature/material pages are not automatically errors. **Remain fatal**: missing/duplicate/misordered Link Panel, over-capacity book, unresolved or schema-v1 display-only symbol, unsupported weather/angle/runtime profile/biome/feature, unavailable required optional mod, and any combination the compiler cannot represent safely. This intentionally differs from Legacy's silent unmatched-symbol skip. #65 still needs the final symbol-specific penalty table and tests.
+For #65, **eligible-to-become-unstable** means a known, supported page whose semantics and resulting world are still deterministic: repeated/conflicting single-choice pages and otherwise valid out-of-order or misplaced pages. The implementation retains every original page, uses the last single-choice page, sorts active categories, and saves 500 per extra/conflicting choice or 100 per misplaced page. These are provisional Rivencraft values, not a full port of every `IAgeSymbol.instabilityModifier`. Missing branches are explicitly classified as zero-cost seeded completion; legal repeated feature/material pages are not automatically errors. **Remain fatal**: missing/duplicate/misordered Link Panel, over-capacity book, unresolved or schema-v1 display-only symbol, unsupported weather/angle/runtime profile/biome/feature, unavailable required optional mod, and any combination the compiler cannot represent safely. Binder and unbound-book previews distinguish blocked writing, seeded completion, and accepted instability before binding; the server revalidates on output. This intentionally differs from Legacy's silent unmatched-symbol skip, universal controller cost assumptions, and modifier-specific dangling costs. A full symbol-specific Legacy penalty port remains a separate balance task, not a claim of parity in this slice.
+
+Automated #65 checks cover classification, preserved input slots on rejection, and an accepted unstable preview. The live output/one-time Age creation check is assigned to in-game testing because the GameTest storage phase stalled when that transaction ran; the test world is not retained.
 
 Proposed server defaults for #66–#72 (to confirm during implementation): instability scoring on for newly created Ages; passive entity effects on; world-mutating hazards **off by default** until an operator opts in; explicit per-Age toggle and separate per-family switches. Enforce a central work budget rather than letting every loaded chunk and provider roll independently: default at most one hazard attempt per Age per 20 ticks, one block mutation per successful attempt, and no forced chunk loads. Budgets should be configurable with hard upper bounds, including active Ages, target radius, tick interval, block changes/explosions/meteor impacts, entity effect attempts, and decay spread. Never target another dimension, unloaded chunk, book preview/snapshot, protected spawn/link platform, or portal. Stop safely when the Age unloads or settings change. These are **Rivencraft proposals**, not Legacy defaults or code that exists today; implementation issues must test/adjust them, especially multiple concurrent Ages. Expose score breakdown, selected effects, enablement, and budget suppression in server diagnostics (#72).