fix(condense): summarize effective history, excluding truncated messages

[PierrunoYT]

Summary

• Context condensation selected messages with getMessagesSinceLastSummary, which ignores truncationParent, so messages already hidden by sliding-window truncation were sent to the condensing request and could exceed the context window.
• Now uses getEffectiveApiHistory, the same history normal requests send. Stored history is preserved (all messages are still tagged with condenseParent).

Fixes #1823

Test plan

• New regression test in condense.spec.ts (fails without the fix, passes with it)
• core/condense, core/context-management, core/task suites pass
• pnpm check-types and lint pass

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between 8bec7c1 and 115f79a.

📒 Files selected for processing (2)

• src/core/condense/__tests__/condense.spec.ts
• src/core/condense/index.ts

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