Streamlit web app over the pipeline (issue #5)

[Divergent-Code]

Implements camunity issue #5 — moves the tool from a linear Colab notebook to a real web app UI. Also unblocks camunity#8 (PDF): resolve_resume() + the app.py/pipeline.py split match the shape camunity#8 expects.

Stacked PR: base is fix/markdown-chunking (top of the fork stack), so this diff is just the new app. Full stack: main ← #1 multi-provider ← #2 injection ← #3 chunking ← this.

What's new

• pipeline.py — the notebook pipeline extracted into a provider-agnostic, Colab-free module: LLMClient (Gemini/Anthropic/DeepSeek/Groq), JD scraping, markdown-aware chunking, threshold retrieval, generation, coverage eval, two-layer injection screen, fabrication check, diff. Importable anywhere; embeddings stay local.
• app.py — Streamlit UI over that pipeline:
  • Sidebar: provider + model + key (Streamlit secrets → env var → session-only field).
  • Inputs: JD paste/URL, résumé upload (.md/.txt) or paste, optional GitHub username.
  • Up-front injection gate — screens the JD (substring + LLM classifier) before anything reaches a prompt; requires explicit confirm if flagged.
  • Real progress via st.status step-by-step (the guidance's rule: show real progress for processing, not a bare spinner).
  • Results in tabs: tailored résumé with [SOURCE] badges + Markdown download · what-changed · coverage detail · fabrication check · diff · run log.
  • Empty state teaches the flow.
• requirements.txt, README.md (run + deploy to Streamlit Cloud / HF Spaces), .gitignore (ignores .streamlit/secrets.toml).

Design

Follows the attached impeccable "product register" guidance: one well-tuned sans, hairline borders + flat surfaces (no shadow/glass), restrained accent — gold for the primary action only, patina for improved/covered, vermilion for gaps/warnings. Avoids the AI-slop tells (side-tab, icon-tile-stack, cream-palette, ai-color-palette, nested-cards). Palette is the Neo-Kinpaku system with OKLCH tokens converted to hex; theme in .streamlit/config.toml.

Verification

• Both modules compile; pure-logic unit checks pass (chunking 1→12 on a one-line résumé, injection screen, coverage eval, diff, output split).
• App boots headless — HTTP 200, no errors — rendering the full form + empty state (confirmed via the page's accessibility tree). A full end-to-end run needs a provider key + the embedding-model download, so that wasn't exercised here.

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