docs: explain X Article, image summaries and summary search

AGENTS.md

@@ -28,6 +28,16 @@ LLM summaries are a post-capture, manual-only subsystem: `crates/archivr-core/sr
 table per (entry, provider, model, prompt version, input hash). See `ARCHIVR-MENTAL-MODEL.md` for the
 provider set and the status lifecycle.
 
+`SummaryBuildOptions` keeps summaries text-only unless `include_images` is set. The input digest includes that flag and
+the selected blobs' SHA-256, MIME types, and sizes, so a distinct image selection cannot reuse a text-only cache row.
+Candidates are `media` artifacts only: `jpg`/`jpeg`, `png`, `webp`, `gif`, and `avif`, capped at four images, 5 MiB each,
+and 12 MiB in aggregate. Anthropic HTTP, OpenAI-compatible HTTP, and Codex support images; Claude CLI does not. The core
+remains synchronous: the server puts provider work in its blocking boundary rather than introducing async to
+`archivr-core`.
+
+Entry free-text search includes summary text (and generated JSON tags inside it) from the latest completed summary only.
+Pending and failed rows do not match, and a newer pending or failed request does not hide an older completed summary.
+
 Per-archive layout (created by `archivr init`): `.archivr/` (name, store_path, `archivr.sqlite`) + sibling `store/` (`raw/`, `raw_tweets/`, `structured/`, `temp/`). Server-level auth lives in a **separate** `archivr-auth.sqlite` (users, sessions, API tokens, role bits GUEST=1/USER=2/ADMIN=4/OWNER=8).
 
 The server mounts multiple archives from a TOML registry (`crates/archivr-server/src/registry.rs`); routes are parameterized by `:archive_id`.
@@ -87,7 +97,7 @@ No CI is configured; no rustfmt.toml/clippy.toml — default `cargo fmt`/`clippy
   *pinned candidate* handed to `resolve_yt_dlp()` (`downloader/ytdlp.rs`), which compares it against a
   self-updated copy in the state dir. `ARCHIVR_YT_DLP_FORCE` (absolute path) bypasses that comparison
   entirely; `ARCHIVR_STATE_DIR` relocates the state dir. Never spawn bare `yt-dlp` — call the resolver.
-- **LLM summaries by env var**: `ARCHIVR_ANTHROPIC_API_KEY` / `ARCHIVR_ANTHROPIC_URL` / `ARCHIVR_ANTHROPIC_MODEL`, `ARCHIVR_OPENAI_API_KEY` / `ARCHIVR_OPENAI_URL` / `ARCHIVR_OPENAI_MODEL`, `ARCHIVR_CLAUDE_CLI` / `ARCHIVR_CLAUDE_MODEL`, `ARCHIVR_CODEX_CLI` / `ARCHIVR_CODEX_MODEL`, plus `ARCHIVR_SUMMARY_HTTP_TIMEOUT` (default 120s) and `ARCHIVR_SUMMARY_CLI_TIMEOUT` (default 300s). Same convention as above — never TOML, which also keeps API keys out of anything the archive persists. Summaries are manual-only: nothing in `capture.rs` triggers them. The two CLI vars are optional overrides: unset, `resolve_cli()` auto-discovers well-known absolute installs first (`/opt/homebrew/bin/claude`, `/usr/local/bin/claude`; `/Applications/ChatGPT.app/Contents/Resources/codex`, `/opt/homebrew/bin/codex`, `/usr/local/bin/codex`), then `$HOME/.local/bin/<name>`, then the bare name on PATH — the absolute defaults matter because the ChatGPT desktop app ships `codex` off PATH.
+- **LLM summaries by env var**: `ARCHIVR_ANTHROPIC_API_KEY` / `ARCHIVR_ANTHROPIC_URL` / `ARCHIVR_ANTHROPIC_MODEL`, `ARCHIVR_OPENAI_API_KEY` / `ARCHIVR_OPENAI_URL` / `ARCHIVR_OPENAI_MODEL`, `ARCHIVR_CLAUDE_CLI` / `ARCHIVR_CLAUDE_MODEL`, `ARCHIVR_CODEX_CLI` / `ARCHIVR_CODEX_MODEL`, plus `ARCHIVR_SUMMARY_HTTP_TIMEOUT` (default 120s) and `ARCHIVR_SUMMARY_CLI_TIMEOUT` (default 300s). Same convention as above — never TOML, which also keeps API keys out of anything the archive persists. Summaries are manual-only: nothing in `capture.rs` triggers them. The two CLI vars are optional overrides: unset, `resolve_cli()` auto-discovers well-known absolute installs first (`/opt/homebrew/bin/claude`, `/usr/local/bin/claude`; `/Applications/ChatGPT.app/Contents/Resources/codex`, `/opt/homebrew/bin/codex`, `/usr/local/bin/codex`), then `$HOME/.local/bin/<name>`, then the bare name on PATH — the absolute defaults matter because the ChatGPT desktop app ships `codex` off PATH. Frontend static output is generated; never hand-edit `crates/archivr-server/static/`.
 - **Frontend**: JSX (no TypeScript), PascalCase components in `frontend/src/components/`, kebab-case CSS classes, plain CSS with custom properties in `styles.css` (no Tailwind/CSS-in-JS). No router — `App.jsx` parses `window.location.pathname` + `history.pushState`. State = `useState` + one `AuthContext`; `sessionStorage` for refresh-resilient dialog state (see `CaptureDialog.jsx` job polling, 500ms). All API calls through `frontend/src/api.js` with relative `/api/*` URLs — add new endpoints there, not inline `fetch`. In-progress captures render through `SkeletonEntryRow.jsx`, which is a compact spinner + locator + "Archiving…" line (with a playlist/channel hint), **not** a grey skeleton block — don't reintroduce placeholder shimmer. Layout comes from semantic classes (e.g. `.capture-text-row` in `styles.css`), never from fallthrough on a generic row class; give a new row shape its own class.
 - **CLI providers parse a file, not stdout**: `codex` is invoked as `codex exec --output-last-message <tempfile> -` (prompt on stdin) and the reply is read back from that file — raw stdout carries a runtime header, an echo of the user prompt, and a `tokens used` footer that the JSON extractor will happily mistake for the answer. There is a positional-prompt fallback for older builds that reject `-`. Keep any new CLI provider on the same "give me only the final message" contract.
 - **Naming (Rust)**: standard snake_case/PascalCase; visibility and roles are bitflag `u32`s, not enums.