docs: bullet-ize README hero; align platform README with new framing

[mandarnilange]

Summary

Two follow-up improvements after the BYO-framework messaging revamp (#7):

1. Main README hero — the dense paragraph after the headline was a wall of text. Replaced it with five scannable bullets organized around the verbs that carry the pitch.
2. Platform README — was still positioned generically; now ties to the new "open framework for agentic workflows" story and makes the BYO framing explicit.

Main README — before / after

Before (one paragraph, 5 ideas mashed together):

Compose agent harnesses in YAML from LLM calls, scripts, validators, and transforms — wired with loops and conditionals. Mix deterministic and non-deterministic steps so your linter, tests, and schemas gate the LLM. Built-in support for Anthropic / OpenAI / Gemini / Ollama, coding-agent runtimes, SQLite / Postgres, OTel, and local / Docker / remote workers. Every layer has an extension point where the built-in doesn't fit. Scale agentic workflows like production infrastructure.

After (parallel-structure bullets, each ~12–15 words):

• Compose agent harnesses in YAML — LLM calls, scripts, validators, transforms, loops, and conditionals.
• Gate the LLM with your tools — deterministic steps (linters, tests, schemas) wrap non-deterministic LLM calls, so output is checked on every run.
• Plug in your stack — Anthropic, OpenAI, Gemini, Ollama, coding-agent runtimes. Every layer has an extension point where the built-in doesn't fit.
• Run anywhere — local, Docker, or remote workers; SQLite or Postgres; OTel-native.
• Scale like infra — multi-worker scheduling, approval gates, cost ceilings, live dashboard.

The bold one-liner hero and the "For platform teams" K8s callout are unchanged.

Platform README — before / after

Before:

Production infrastructure for AgentForge. Distributed execution, PostgreSQL, full observability, crash recovery.

Extends @mandarnilange/agentforge-core with everything needed to run AI agent workflows at scale — Docker/remote executors, PostgreSQL persistence, OpenTelemetry tracing, rate limiting, and multi-node worker scheduling.

After:

Production infrastructure for AgentForge. Run agentic workflows at scale — distributed execution, PostgreSQL, full observability, crash recovery.

Extends @mandarnilange/agentforge-core — the open framework for agentic workflows — with everything needed to run it at scale: Docker / remote executors, PostgreSQL persistence, OpenTelemetry tracing, rate limiting, and multi-node worker scheduling. Bring your own LLMs, scripts, agents, and infra; this package handles the orchestration plane.

Aligns with the core README so a reader landing on either npm page gets a consistent story.

What was not changed

• Hero one-liner — already tight, no changes.
• "For platform teams" K8s callout — kept as-is.
• Status / version note — kept as-is.
• Architecture docs, CHANGELOG — kept as-is (same rationale as docs: revamp messaging — open framework for agentic workflows #7).

Test plan

• README hero renders cleanly on GitHub (bullet alignment, no orphaned bold)
• Platform README renders cleanly on GitHub
• Both READMEs ship with the next npm publish (descriptions don't update retroactively)