fix(opencode): register the ruleset on the compaction hook (#1086) (#1089)

Author: sergiopadure

.opencode/plugins/ponytail.mjs

@@ -132,11 +132,15 @@ export default {
 
     // Append the ruleset to the system prompt every turn. V2 hands over owned
     // system parts, so push one instead of rewriting the tail of another.
-    await ctx.session.hook('context', (event) => {
+    // Summary compaction runs its own hook with the same event shape; without
+    // it the compaction request misses the ruleset and the provider prompt cache.
+    const addRuleset = (event) => {
       const mode = readMode();
       if (mode === 'off') return;
       event.system.push({ type: 'text', text: getPonytailInstructions(mode) });
-    });
+    };
+    await ctx.session.hook('context', addRuleset);
+    await ctx.session.hook('compaction', addRuleset);
   },
 
   // OpenCode V1: same three behaviors, as hooks on the V1 hook names.

tests/opencode-plugin.test.js

@@ -136,6 +136,23 @@ test('V2 context hook injects the ruleset, and stays silent when off', async ()
   assert.deepEqual(quiet.system, []);
 });
 
+test('V2 compaction hook injects the same ruleset as context, and stays silent when off (#1086)', async () => {
+  try { fs.unlinkSync(statePath); } catch (e) {}
+  let { hooks } = await setupV2();
+  const fromContext = { system: [] };
+  const fromCompaction = { system: [] };
+  await hooks.context(fromContext);
+  await hooks.compaction(fromCompaction);
+  assert.equal(fromCompaction.system.length, 1);
+  assert.deepEqual(fromCompaction.system, fromContext.system);
+
+  fs.writeFileSync(statePath, 'off');
+  ({ hooks } = await setupV2());
+  const quiet = { system: [] };
+  await hooks.compaction(quiet);
+  assert.deepEqual(quiet.system, []);
+});
+
 test('V2 unsupported /ponytail arguments do not reset the current mode', async () => {
   const { added } = await setupV2();
   fs.writeFileSync(statePath, 'ultra');