prosolis a4069d5755 Phase 3: LLM grammar checkpoint
Backend (internal/llm): backend-agnostic LLMClient interface + factory
with vLLM (OpenAI-compat) and Ollama (native) clients, each Complete +
Stream. prompts.go holds the checkpoint and Ask Petal templates;
checkpoint.go salvages JSON from model output (brace-matched), enforces a
per-doc 30s RateLimiter, and truncates the doc to a latency cap.

internal/suggestions: POST /api/docs/:id/check runs a checkpoint and
replaces the doc's pending suggestions in one tx (accepted/rejected kept
as history); GET /api/docs/:id/suggestions lists pending;
POST /api/suggestions/:id/{accept,dismiss} resolves one. Throttled checks
return the current set rather than erroring.

Frontend: useCheckpoint (4s debounce, loads existing on open, stale-guard
tokens); SuggestionHighlight renders ProseMirror decorations re-anchored
by the `original` string on every doc change (not stored marks), with
precise textblock-offset→PM-position mapping; SuggestionCard shows the
type tag + diff + explanation and applies the replacement in-editor on
accept; breathing rose checkpoint dot in the StatusBar; fade-float +
breathe animations.

Tests: llm parse/rate-limit/truncate; suggestions full flow + rate-limit
over httptest with a stub client. Smoke-tested end-to-end against a fake
vLLM endpoint (anchoring verified) and the LLM-unreachable 502 path.

Claude-Session: https://claude.ai/code/session_016Yr6jELuRc7hyzYLccQKZd
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🌸 Petal

A self-hosted, privacy-first writing editor with warm bubbly design, auto-save, and local-LLM grammar/ESL suggestions. See petal-spec.md for the full design spec and BUILD_PLAN.md for build progress.

Stack

Go + chi backend · SQLite (modernc, pure Go) · React + Vite + Tiptap + Tailwind v4 frontend · local vLLM/Ollama for AI suggestions. Single-binary deployment (frontend embedded via go:embed).

Local development

Two processes during development:

# 1. Backend (serves /api on :8080)
go run ./cmd/server

# 2. Frontend dev server (HMR on :5173, proxies /api → :8080)
cd web && npm install && npm run dev

Open http://localhost:5173 while developing.

Production build (single binary)

cd web && npm run build      # emits web/dist (embedded by the Go binary)
cd .. && go build -o petal ./cmd/server
./petal                      # serves UI + API on :8080

Configuration is via environment variables — copy .env.example to .env.

Status

Early build, multi-session. Auth (Authentik), Copyleaks plagiarism, and Docker/Traefik deployment are deferred — see BUILD_PLAN.md.

Description
Petal is a self-hosted, privacy-first writing editor for an ESL user. It replaces Grammarly with a warm, bubbly web app that combines Tiptap rich text editing, auto-save cloud storage, and periodic AI-powered grammar/ESL suggestions backed by a local vLLM inference endpoint.
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