chore: seed ai-baseline canonical workflow repo

Canonical Olsitec agentic baseline (copied from olsicloud4 000_baseline_v2.md),
re-homed per ADR-003 to be hosted in foundation-Forgejo.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.gitignore

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+.DS_Store

README.md

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+# ai-baseline
+
+The **canonical single source of truth** for the Olsitec agentic workflow pattern — how AI agents
+operate across all Olsitec projects (operating modes, prime directives, documentation thresholds,
+delegation contract, session/snapshot/transfer protocols).
+
+- [`000_baseline.md`](000_baseline.md) — the full baseline.
+- `_templates/` — ADR, contract, session, and snapshot templates.
+
+## How projects consume it
+Each project's `documentation/000_baseline.md` is a **thin overlay** that references this file and
+lists only project-specific deviations (see the foundation's overlay at
+`../foundation/documentation/000_baseline.md` for an example).
+
+## Hosting
+This repo realizes **ADR-003** (centralized AI baseline), but **re-homed from gitlab.com to
+foundation-Forgejo** (`forge.olsitec.de/olsitec/ai-baseline`) — the foundation replaces the SaaS git
+host. Versioned with git tags (e.g. `v2.0.0`); projects pin or track a tag.
+
+## Provenance
+`000_baseline.md` was copied from `olsicloud4/documentation/000_baseline_v2.md` (the prior canonical
+location) on 2026-06-30. Future improvements land here and propagate to projects via overlay updates.