`codegraph install` no longer indexes the current directory — it wires up agents
only, and building a project's graph is always the explicit `codegraph init` /
`index`. Removes the global-vs-local inconsistency (a local install silently
indexed, a global one didn't) and the docs/behavior mismatch (#826). README
updated to match; the stale `init --index` note (indexing is default now) fixed.
Adds an opt-in Claude Code front-load hook: a `UserPromptSubmit` hook that runs
the new hidden `codegraph prompt-hook`, which injects codegraph_explore context
for structural ("how / where / trace / impact") prompts so the agent answers
from the graph instead of grepping to rebuild it. Prompted at install
(default-yes; Claude-only — the only agent with prompt hooks), removed on
uninstall, and `codegraph upgrade` self-heals it onto an already-configured
global Claude install. Strictly additive + degradable: non-structural prompts,
un-indexed projects, and any failure are silent no-ops. Disable without
uninstalling via CODEGRAPH_NO_PROMPT_HOOK=1.
7 new installer-targets contract tests (write / idempotent / opt-out round-trip /
sibling-preserved / uninstall / legacy-independent). Full suite green.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Colby McHenry
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