Initialize repository with harness code and assets

Initial import of all source code, config, and README assets: the
packages workspace (cli, core, server, web, docs, landing, skills),
build scripts, tooling config, and CI workflows.

Includes the data-layout revision made on this branch: the local data
root defaults to ~/.penguin/data (PENGUIN_HOME still overrides; the
installer keeps its binaries in ~/.penguin), and every Agent lives
under <project>/agents/<agent>/ — path helpers, the three
agent-enumeration scans, the system prompt, built-in Skills, tests
and docs all follow the new layout.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018ihk8iQuo3kv2aPjAYEPuR

.env.example

@@ -0,0 +1,9 @@
+# Copy to .env (ignored by .gitignore) and fill in real values for local runs and e2e.
+# e2e picks a Provider by available key, in order: Claude (ANTHROPIC_API_KEY) -> DeepSeek (DEEPSEEK_API_KEY).
+ANTHROPIC_API_KEY=
+# Optional: custom Claude gateway URL (defaults to AgentHub if unset).
+# ANTHROPIC_BASE_URL=
+# DeepSeek (CI's e2e uses this key, model deepseek-v4-flash).
+DEEPSEEK_API_KEY=
+# Optional: custom DeepSeek gateway URL (defaults to the official https://api.deepseek.com).
+# DEEPSEEK_BASE_URL=