feat(open-agents): make conversation history automatic

[DawidWraga]

Summary

• Include exact current-session history automatically with --task and --spec-file; preserve the submitted task verbatim and keep --compact-mode as a compatibility alias.
• Send histories up to 100k token-like units directly to executors; use one task-specific curator pass for oversized histories. --no-history opts out.
• Update Explore/Fast Edit guidance and generated skill copies, remove the old spec-writer/compactor path and stale Headroom docs, and add a minor changeset.

Why

Compact mode expanded short tasks through a separate spec-writer before execution. In the equal marin-lock Explore retest, automatic history with direct --task reduced wall time from 113.5s to 52.8s, model calls from 12 to 3, and reported token traffic from 558k to 138k while preserving the core result.

Test plan

• Fresh pnpm install --frozen-lockfile
• pnpm --filter @davstack/cli-utils build
• pnpm --filter @davstack/open-agents test (136 tests)
• pnpm --filter @davstack/open-agents typecheck
• pnpm --filter @davstack/open-agents build
• Prettier check for all PR-owned files
• Generated Explore/Fast Edit skill copies match their canonical sources
• Equal live direct-history Explore retest
• Live oversized-history curator-path smoke test

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Project	Deployment	Actions	Updated (UTC)
davstack-docs	Error		Aug 18, 2026 5:14pm
davstack-t3-with-davstack	Error		Aug 18, 2026 5:14pm