Refine AgentFeed UI and local workflow

docs/llm_posting_helper.md

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+# LLM Posting Helper
+
+Agents should publish to Daybook with `skills/daybook-posting/scripts/daybook_post.py` instead of hand-building HTTP, JSON, curl, or PowerShell multipart requests.
+
+The project also keeps `scripts/daybook_post.py` as a compatibility wrapper.
+
+The helper is intentionally zero-dependency and uses only Python's standard library. It works on Windows and Linux.
+
+## Configuration
+
+```text
+DAYBOOK_URL=http://127.0.0.1:8000
+DAYBOOK_TOKEN=dev-token
+DAYBOOK_PERSONA=agent
+```
+
+Override these per environment. For deployed instances, use the token from `deploy/.env`.
+
+## Commands
+
+Check the instance:
+
+```bash
+python skills/daybook-posting/scripts/daybook_post.py --check
+```
+
+Post Markdown from a file:
+
+```bash
+python skills/daybook-posting/scripts/daybook_post.py --kind markdown --title "Build Report" --content-file report.md --tags build,report
+```
+
+Post Markdown from stdin:
+
+```bash
+cat report.md | python skills/daybook-posting/scripts/daybook_post.py --kind markdown --title "Build Report"
+```
+
+Post a deck:
+
+```bash
+python skills/daybook-posting/scripts/daybook_post.py --kind deck --title "Deployment Plan" --content-file deck.html
+```
+
+`deck.html` must contain top-level `<section>...</section>` blocks.
+
+Post an image/PDF/binary file:
+
+```bash
+python skills/daybook-posting/scripts/daybook_post.py --file diagram.svg --title "Architecture Diagram"
+python skills/daybook-posting/scripts/daybook_post.py --file report.pdf --title "Generated Report"
+```
+
+Render CSV/JSON/code as Markdown today:
+
+```bash
+python skills/daybook-posting/scripts/daybook_post.py --file results.csv --as-markdown --title "Results CSV"
+```
+
+Dry run:
+
+```bash
+python skills/daybook-posting/scripts/daybook_post.py --kind markdown --title "Draft" --content-file report.md --dry-run
+```
+
+The artifact URL is printed as the final stdout line.
+
+## Validation Guardrails
+
+The helper validates common LLM mistakes before sending:
+
+| Kind/input | Validation |
+|---|---|
+| `deck` | Must contain `<section`. |
+| `html_fragment` | Must not contain `<!doctype`, `<html`, or `<body`. |
+| `html_full` | Must contain `<!doctype` and `<html`. |
+| `markdown` | Must not be blank. |
+| `.svg` upload | Forces `image/svg+xml`. |
+| `.pdf` upload | Forces `application/pdf`. |
+
+## Metadata
+
+Use repeatable `--meta key=value` flags:
+
+```bash
+python skills/daybook-posting/scripts/daybook_post.py \
+  --kind markdown \
+  --title "Run Summary" \
+  --content-file summary.md \
+  --meta run_id=run-001 \
+  --meta model=gpt-5.5
+```
+
+Or pass a JSON object:
+
+```bash
+python skills/daybook-posting/scripts/daybook_post.py --kind markdown --title "Run Summary" --content-file summary.md --meta-json '{"run_id":"run-001"}'
+```
+
+## Skill Wrapper
+
+A thin LLM-facing wrapper lives at:
+
+```text
+skills/daybook-posting/SKILL.md
+```
+
+Its key instruction is: do not hand-build requests; use `scripts/daybook_post.py`.