Refactor dice face handling with centralized face type definitions, tests, and added light/dark side support (#15)

* refactor(dice): use centralized dice face mappings for result calculations

- Introduced diceFaces.ts to centralize die face symbol mappings.
- Updated dice.ts to replace switch-case with lookups from diceFaces constants.
- Added new types for die face values in types.ts.
- Exported dice face constants and types from index.ts.
- Updated tests to reflect new dice face mappings and fixed inconsistencies.

This refactor improves maintainability and consistency by consolidating die face data.

Co-authored-by: terragon-labs[bot] <terragon-labs[bot]@users.noreply.github.com>

* feat!: add automatic light/dark side points to dice pools

- Added automaticLightSide and automaticDarkSide to DicePool type
- Updated sumResults function to handle automatic force points
- Updated CLI to parse +ls/lightside and +ds/darkside modifiers
- Added comprehensive tests for automatic force points

BREAKING CHANGE: Dice face mappings have been corrected to match official SWRPG specifications. Boost die faces 3-6 and Force die face distributions have been fixed. This changes the probability distributions for these dice.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

* fix: correct boost die face mappings to match official specification

- Face 3: Changed from (A)(A) to (S)
- Face 4: Changed from (A) to (S)(A)
- Face 5: Remains (S)(A) - already correct
- Face 6: Changed from (S) to (A)

Updated all corresponding tests to match corrected face mappings.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

---------

Co-authored-by: terragon-labs[bot] <terragon-labs[bot]@users.noreply.github.com>
Co-authored-by: Claude <noreply@anthropic.com>

Author: 3 people

package-lock.json

@@ -56,6 +56,10 @@ export function parseDiceNotation(input: string): DicePool {
           "triumph",
           "d",
           "despair",
+          "ls",
+          "lightside",
+          "ds",
+          "darkside",
           "ua",
           "upgradeability",
           "ud",
@@ -96,6 +100,14 @@ export function parseDiceNotation(input: string): DicePool {
             case "despair":
               pool.automaticDespairs = (pool.automaticDespairs || 0) + value;
               break;
+            case "ls":
+            case "lightside":
+              pool.automaticLightSide = (pool.automaticLightSide || 0) + value;
+              break;
+            case "ds":
+            case "darkside":
+              pool.automaticDarkSide = (pool.automaticDarkSide || 0) + value;
+              break;
             // Upgrades and downgrades
             case "ua":
             case "upgradeability":