Move the hardcoded context priority groups from cmd_load_context()
into the config file as [context.NAME] sections. Add journal_days
and journal_max settings. The config parser handles section headers
with ordered group preservation.
Consolidate load-memory.sh into the memory-search binary — it now
handles both session-start context loading (first prompt) and ambient
search (subsequent prompts), eliminating the shell script.
Update install_hook() to reference ~/.cargo/bin/memory-search and
remove the old load-memory.sh entry from settings.json.
Add end-user documentation (doc/README.md) covering installation,
configuration, all commands, hook mechanics, and notes for AI
assistants using the system.
Co-Authored-By: ProofOfConcept <poc@bcachefs.org>
