fix: broadcast uses summaryForStore to support salvaged summaries (#1718)

syncAndBroadcastSummary was using the raw ParsedSummary (null when salvaged)
instead of summaryForStore for the SSE broadcast, causing a crash when the
LLM returns <observation> without <summary> tags. Also removes misplaced
tree-sitter docs from mem-search/SKILL.md (belongs in smart-explore).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

plugin/skills/mem-search/SKILL.md

@@ -126,54 +126,6 @@ get_observations(ids=[11131, 10942, 10855], orderBy="date_desc")
 - **Batch fetch:** 1 HTTP request vs N individual requests
 - **10x token savings** by filtering before fetching
 
-## Smart-Explore Language Support
-
-Smart-explore tools (`smart_search`, `smart_outline`, `smart_unfold`) use tree-sitter AST parsing. The following languages are supported out of the box.
-
-### 24 Bundled Languages
-
-JS, TS, Python, Go, Rust, Ruby, Java, C, C++, Kotlin, Swift, PHP, Elixir, Lua, Scala, Bash, Haskell, Zig, CSS, SCSS, TOML, YAML, SQL, Markdown
-
-### Markdown Special Support
-
-Markdown files get structure-aware parsing beyond generic tree-sitter:
-
-- **Heading hierarchy** -- `#`/`##`/`###` headings are extracted as nested symbols (sections contain subsections)
-- **Code block detection** -- fenced code blocks are surfaced as `code` symbols with language annotation
-- **Section-aware unfold** -- `smart_unfold` on a heading returns the full section content (heading through all subsections until the next heading of equal or higher level)
-
-### User-Installable Grammars via `.claude-mem.json`
-
-Add custom tree-sitter grammars for languages not in the bundled set. Place `.claude-mem.json` in the project root:
-
-```json
-{
-  "grammars": {
-    "gleam": {
-      "package": "tree-sitter-gleam",
-      "extensions": [".gleam"]
-    },
-    "protobuf": {
-      "package": "tree-sitter-proto",
-      "extensions": [".proto"],
-      "query": ".claude-mem/queries/proto.scm"
-    }
-  }
-}
-```
-
-**Fields:**
-
-- `package` (string, required) -- npm package name for the tree-sitter grammar
-- `extensions` (array of strings, required) -- file extensions to associate with this language
-- `query` (string, optional) -- path to a custom `.scm` query file for symbol extraction. If omitted, a generic query is used.
-
-**Rules:**
-
-- User grammars do NOT override bundled languages. If a language is already bundled, the entry is ignored.
-- The npm package must be installed in the project (`npm install tree-sitter-gleam`).
-- Config is cached per project root. Changes to `.claude-mem.json` take effect on next worker restart.
-
 ## Knowledge Agents
 
 Want synthesized answers instead of raw records? Use `/knowledge-agent` to build a queryable corpus from your observation history. The knowledge agent reads all matching observations and answers questions conversationally.