Remove remaining text truncation across delta engine, memory, and ideas

The prior fix (753c676) only removed truncation at source ingestion and
alert formatting. Signals were still being cut to 120 chars in the delta
engine, 80 chars in memory snapshots, and 120 chars in the ideas LLM
context — so OSINT posts arrived at the alerter already truncated.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

lib/delta/engine.mjs

@@ -161,7 +161,7 @@ export function computeDelta(current, previous, thresholdOverrides = {}) {
     if (hash && !prevHashes.has(hash)) {
       signals.new.push({
         key: `tg_urgent:${hash}`,
-        text: post.text?.substring(0, 120),
+        text: post.text,
         item: post,
         reason: 'New urgent OSINT post',
       });

lib/delta/memory.mjs

@@ -199,7 +199,7 @@ export class MemoryManager {
       bls: data.bls,
       treasury: data.treasury,
       gscpi: data.gscpi,
-      tg: { posts: data.tg?.posts, urgent: (data.tg?.urgent || []).map(p => ({ text: p.text?.substring(0, 80), date: p.date })) },
+      tg: { posts: data.tg?.posts, urgent: (data.tg?.urgent || []).map(p => ({ text: p.text, date: p.date })) },
       thermal: (data.thermal || []).map(t => ({ region: t.region, det: t.det, night: t.night, hc: t.hc })),
       air: (data.air || []).map(a => ({ region: a.region, total: a.total })),
       nuke: (data.nuke || []).map(n => ({ site: n.site, anom: n.anom, cpm: n.cpm })),