fix: resolve clippy warnings in lsp module

- Replace map_or(false, ...) with is_none_or(... !=)
- Replace explicit auto-derefs (&*Static) with auto-deref (&Static)
- Refactor range-indexed loop to iterator with enumerate + skip/take
- Suppress deprecated root_path field with allow(deprecated)

docs: update README and REQUIREMENTS for streamd lsp

- Add streamd lsp to commands table in README
- Add Editor Integration section with Zed, Neovim, VS Code snippets
- Add R25 LSP requirements (R25a–R25e) to REQUIREMENTS.md

README.md

@@ -69,6 +69,7 @@ Within files, `@`-prefixed markers at the beginning of paragraphs or headings de
 - `streamd todo --show-future` — Include tasks with future dates in the listing
 - `streamd edit [number]` — Edit a stream file by index (most recent first)
 - `streamd timesheet` — Generate time reports from `@Timesheet` markers
+- `streamd lsp` — Start the LSP server (stdin/stdout transport; see [Editor Integration](#editor-integration) below)
 
 ## Configuration
 
@@ -110,3 +111,68 @@ Running `streamd todo` finds all shards marked as open tasks and displays them n
 You can quickly edit or complete tasks by number:
 - `streamd todo 1 edit` opens task 1 in your editor at the correct line
 - `streamd todo 1 done` marks task 1 as done by inserting `@Done` after `@Task`
+
+## Editor Integration
+
+`streamd lsp` starts a Language Server Protocol server that provides IDE features for your stream markdown files. The server communicates over **stdin/stdout** and auto-activates only when a `.streamd.toml` file is present in the workspace root.
+
+### Features
+
+| Feature | Description |
+|---|---|
+| `@` completions | Suggests known markers from your config; conditional suggestions (e.g. `@Done` when `@Task` is on the line) |
+| Temporal snippets | `@` followed by a digit offers `YYYYMMDD` / `HHMMSS` format snippets |
+| Diagnostics | File-name format warnings (R15); timesheet errors (overlapping timecards, unclosed days) |
+| Document symbols | Shard tree exposed as outline symbols |
+| "Mark task as done" | Quick-fix code action: inserts `@Done` after `@Task` |
+| Workspace symbols | Search shards across all `.md` files |
+| References | Find all occurrences of an `@Marker` across the workspace |
+| Rename | Rename an `@Marker` across all files |
+
+### Zed
+
+Add to `~/.config/zed/settings.json`:
+
+```json
+{
+  "languages": {
+    "Markdown": {
+      "language_servers": ["streamd-lsp", "..."]
+    }
+  },
+  "lsp": {
+    "streamd-lsp": {
+      "binary": {
+        "path": "streamd",
+        "arguments": ["lsp"]
+      }
+    }
+  }
+}
+```
+
+The `"..."` keeps Zed's default Markdown servers (e.g. `marksman`) active alongside streamd.
+
+### Neovim (nvim-lspconfig)
+
+```lua
+local lspconfig = require('lspconfig')
+local configs = require('lspconfig.configs')
+
+if not configs.streamd then
+  configs.streamd = {
+    default_config = {
+      cmd = { 'streamd', 'lsp' },
+      filetypes = { 'markdown' },
+      root_dir = lspconfig.util.root_pattern('.streamd.toml'),
+      single_file_support = false,
+    },
+  }
+end
+
+lspconfig.streamd.setup {}
+```
+
+### VS Code (tasks.json / manual)
+
+Use any extension that lets you configure custom LSP servers, pointing `cmd` to `streamd lsp`.