SwarmVault 3.19.0

• Added swarmvault graph callers <symbol> (CLI) and graph_callers (MCP): lists every caller of a symbol from graph call edges with exact file:line call-site evidence, scanning only the files the graph identifies as callers. Live token A/B testing showed caller/impact questions were the one category where agents still fell back to repo-wide grep; this closes that gap, and hook guidance now points who-calls/impact questions at it.
• Fixed cross-file calls edges being dropped at extraction: call-name candidates now include imported local names (named, aliased, and default imports) in both the TypeScript-AST and parser-fallback analyzers, so calls into imported symbols resolve through the import map into cross-module graph edges instead of only same-module ones.
• Added host-project hygiene to swarmvault install: vault artifact directories are appended to .gitignore in git repos, excluded from strict-JSON tsconfig.json files so stored source copies under raw/ no longer break the host project's typecheck, and linter configs that still cover the artifact directories produce an advisory warning. Commented (JSONC) tsconfig files are never rewritten — a warning explains the manual edit instead — and everything is skipped when SWARMVAULT_OUT keeps artifacts outside the repo.
• Updated OSS docs, localized READMEs, site docs, and the published ClawHub skill bundle for the new caller-evidence and install-hygiene workflows.
• Bumped OSS packages, viewer, Obsidian plugin metadata, MCP-facing version, ClawHub skill metadata, and desktop package metadata to 3.19.0.