saber 0.7.2

Consolidates the 0.7.1.x development cycle.

Changes

fn_graph() now accepts cache_dir, mirroring blast_radius() and symbols(). The default is unchanged. The example and tinytest pass tempdir() so R CMD check no longer leaves files under tools::R_user_dir("saber", "cache") (#32).
briefing_git() no longer leaks a system2() “had status 128” warning when run against a non-repository (e.g. a worktree, an invalid .git, or a dubious-ownership directory). It now confirms the working tree with git rev-parse and suppresses the warning, returning empty silently (#33).
The SessionStart hook only sources a local package’s R/ when that package is saber itself, so a same-named function exported by another project on the load path is no longer picked up in place of saber’s (#31).

Rebranded package as “Context Engineering for Large Language Model Agents”.
briefing() now emits output via message() instead of cat() for CRAN compliance.
agent_context() examples use \donttest{} instead of \dontrun{}.
agent_context() and the SessionStart hook now load memory reciprocally: Codex receives Claude Code MEMORY.md, while Claude Code, Corteza, and other non-Codex agents receive Codex memories.
Codex hook setup docs now use [features].hooks instead of deprecated [features].codex_hooks.
Added Depends: R (>= 4.4.0) and removed local %||% definition (now in base R).
Added copyright holder person("cornball.ai", role = "cph") to Authors@R.
Expanded acronyms in DESCRIPTION (“AI”, “AST”) per CRAN policy.
Single-quoted file-name references in DESCRIPTION (‘AGENTS.md’, ‘CLAUDE.md’).
Added ?saber package-level help page.
README examples switched from r -e to Rscript -e for portability.
Fix blast_radius() vignette scan crashing on Windows paths (backslashes were interpreted as regex backreferences).
Replace em-dashes in roxygen @title lines with colons to keep the generated Rd files ASCII-clean.

agent_context() assembles agent context from memory, instructions, and identity files.
fn_graph(), pkg_graph(), and graph_svg() render interactive SVG call graphs.
blast_radius() gains include parameter for scanning @examples and vignettes.