pensar 0.4.2

CRAN review compliance.
default_vault() and default_site_dir() no longer fall back to tools::R_user_dir(). Per CRAN policy pensar will not silently write to the user’s home filespace; if no vault is configured via PENSAR_VAULT, walk-up schema.md, or options("pensar.vault"), the call errors with a setup hint. Pass vault = (or path = for init_vault()) explicitly to write to a one-off path. Breaking for users who relied on the implicit ~/.local/share/R/pensar/ fallback – run use_vault('/path/to/vault') once or set PENSAR_VAULT to restore the previous behavior.
vault_export() now requires either PENSAR_SITE_DIR or an explicit out_dir =; the cache fallback is gone for the same reason.
Title shortened to LLM Wiki Engine. Description tidied. Added SystemRequirements: pandoc, git. Dropped unused jsonlite from Suggests.
Every exported function now has a runnable @examples block, using tempdir() / tempfile() so nothing leaks into the user’s home filespace at example time.
vault_graph() and ingest_briefing() error messages reworded to drop the GitHub install URL.

pensar 0.4.1

default_vault() resolution order changed so project-local vaults beat a global .Rprofile default. New order: PENSAR_VAULT env var > walk-up from getwd() for a schema.md marker > the options("pensar.vault") value set by use_vault() > the R_user_dir() fallback. Previously the option won over the env var, which made PENSAR_VAULT=... ineffective once use_vault() ran in .Rprofile. Walk-up is new: cd into a project vault and the CLI Just Works without unsetting your global default.

New vault_graph() renders the vault’s wikilink graph as static SVG via saber::graph_svg(). Tooltips carry title, type, date, tags, and a lede from the first meaningful body line. Broken wikilinks appear as separate nodes. Default viewport 1600x1200 for denser vaults.

default_vault() now honors options("pensar.vault") and the PENSAR_VAULT environment variable before falling back to tools::R_user_dir("pensar", "data"). Previously, the vault path was hardcoded to the R_user_dir() path with no escape hatch, so a nicer path like ~/wiki required passing vault = to every call.
New use_vault() sets options("pensar.vault") for the session, mirroring hacer::use_repo().

New ingest_briefing() generates a saber briefing via saber::briefing() and ingests it into the vault. Replaces the direct cache-file read in inst/scripts/session-start.R with a real function call, so briefings refresh on ingest instead of depending on saber’s hook having run first.
saber added to Suggests (previously coupled only via filesystem).

Initial release: LLM wiki engine with init_vault(), ingest(), update_index(), log_entry(), status(), backlinks(), outlinks(), show_page(), lint(), and vault_export().