v0.1.0

Stable pre-1.0 release of pu.sh.

Highlights:

• Zero-package-dependency coding agent in a 49,276-byte shell script.
• Hardened trace/history handling to avoid recursive event-log growth.
• /flush now resets history metadata and event replay logs.
• OpenAI reasoning summaries support via AGENT_REASONING_SUMMARY and /reasoning.

Validation:

• sh -n pu.sh
• sh -n pu-unminified.sh
• scripts/minify-pu --check --no-tests
• bash eval/test_real.sh: PASS 110 / FAIL 0