[codex] Fix CLI help and quest diagnostics

[MukundaKatta]

Summary

• regroup root help into Core and Inspection command groups
• align root help vocabulary around lore and quest verbs
• remove stale root help wording such as static binary and alias-forward references
• include quest diagnostics and storage robustness fixes already verified on this branch

Fixes #60
Refs #26
Refs #29

Validation

• go test ./internal/cli ./internal/quest ./internal/mcp
• git diff --check

[kunallanjewar]

Thanks for the broad pass here. There's real work in this PR (#60's cobra command groups, the codex mcp list wire-up for the registration pre-check, the storage sqlite_error helper, the quest scroll improvements) and I'd like to land the pieces individually. Closing this one because the 47-file bundle has become unmergeable in its current shape:

• The lore catalog --kind validation is now redundant: fix: validate catalog kind overrides #97 landed today and reuses the existing ErrInvalidKind / isValidKind machinery in inscribe.go.
• The 0o755 → 0o700 changes in cli/lore_read.go and cli/quest.go are superseded by fix(install): create ~/.guild with 0700 perms #80 (also landed today), which centralises this through a new internal/guildpath package with EnsureDir + TightenDBPerms so all six call sites stay consistent and the WAL/SHM/journal sidecars get tightened too.
• The branch is now behind main with real conflicts on those files, and the bundling makes per-concern review hard.

If you're up for it, the highest-leverage splits I'd happily take as separate PRs against current main:

1. cli: regroup root --help and unify domain verbs #60 root-help command groups — the Core/Inspection grouping in internal/cli/root.go plus the GroupID additions across the verb files and the root_test.go assertions. Standalone, ~80 lines.
2. codex ListArgv wire-up — internal/install/clients.go (the one-line set) plus the well-formed test guard. Standalone, ~5 lines.
3. Quest scroll "why blocked" surface ([feature] surface "why is this quest blocked" without requiring SQL access #29) — internal/quest/scroll.go, scroll_cmd.go, scroll_test.go. Standalone medium PR worth landing on its own merits.
4. internal/storage/sqlite_error helper + db.go integration — useful primitive, deserves its own focused review.
5. embedder_health_cmd OpenQuestDB wiring — depends on the Deps change in command.go; ship together.

Each of those would land in a fraction of the time a 47-file PR does, and you'd avoid the merge-cliff problem when other contributors are working the same surfaces. If you'd rather rebase and split inside this PR, that works too — just reopen.

Appreciate the contribution and hope to see the splits.