Adds a final step to bootstrap.Init that offers to wire `veans prime`
into Claude Code and OpenCode automatically. Per-agent yes/no prompts
default to "yes" for Claude Code and "no" for OpenCode; --install-claude
/ --install-opencode flags skip the prompt for scripted contexts;
--no-hooks falls back to the previous behaviour of just printing the
snippets.
Claude Code:
- Writes/merges .claude/settings.json
- JSON merge preserves existing keys (model, permissions, other hooks)
and only appends a `veans prime` command entry under SessionStart
and PreCompact if one isn't already there
- Idempotent: re-running reports "Already configured" without
duplicating entries
OpenCode:
- Writes .opencode/plugin/veans-prime.ts with the standard handler
skeleton
- Existing files are left alone (no TS-merge story for v0)
Failures during hook install are non-fatal: the repo is already
configured, so the user gets a warning + the printed snippets as a
fallback path.
Unit tests cover the merge logic (fresh file, idempotent rerun,
preserving user's other hooks/keys), the install actions
("Wrote"/"Updated"/"Already configured"), and the offer flow
(flags-bypass-prompt vs prompt-when-unset vs no-hooks).
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