docs(readme): add one-line description of the repo

[Kalindi-Dev]

Summary

Adds a concise one-line note near the top of the README describing what this repository is — a sample self-hosted platform for autonomous background coding agents on AWS that turns a submitted coding task into a ready-to-review pull request.

The line is placed as a blockquote directly under the badge header and above the existing ## What is ABCA section, so it acts as a quick tagline before the fuller explanation.

Changes

• README.md: added a one-line blockquote description of the repo.
• Per the active acme/readme-helper skill, added an ABCA-REVIEWED marker comment near the top of the edited file.

Build and test results

• mise run build — FAILED, but the failure is pre-existing and environmental (//cli:eslint reports ../node_modules/.bin/eslint: not found), unrelated to this documentation-only change. The initial build and lint were already reported as failing before any agent changes. No source/build files were touched by this PR.

Decisions made

• Chose a blockquote tagline placement (below the header, above the intro) for a clean one-line note without disrupting existing content.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of the project license.

Agent notes

• What went well: The task was small and unambiguous; the README structure made placement obvious.
• What was difficult: The build environment cannot complete mise run build because the eslint binary is missing from node_modules/.bin. This is environmental and pre-existing, not caused by this change.
• Conventions discovered: Repo uses conventional commits with a module scope (docs(readme): ...), enforces an approved-issue governance workflow (ADR-003), and relies on mise tasks rather than raw tooling. The acme/readme-helper skill requires an ABCA-REVIEWED marker in edited files.
• Suggestions for future tasks: Ensure mise run install fully provisions node_modules/.bin so build/lint gating actually runs; configure pipeline.buildCommand in the blueprint to enable build-regression gating.

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