[Feature gap] Report explicit Read deny-rule decisions in headless JSON output

## Summary

A path-scoped native Read deny rule blocks the read, but the headless stream does not report that decision through a typed permission-denial event or the terminal `permission_denials` entry for that call.

This is a reporting/observability feature gap, not a vulnerability report. The observed blocking works; no enforcement bypass is claimed.

## Minimal reproduction recipe

Requires an already authenticated Claude Code installation. The shell creates one synthetic file in a fresh temporary directory; it does not use private files or a custom runner.

```sh
(
repro_dir="$(mktemp -d /tmp/claude-deny-report.XXXXXX)" || exit 1
cd "$repro_dir" || exit 1
printf '%s\n' 'SYNTHETIC_DENY_REPORT_MARKER' > blocked-read.txt

claude -p --verbose --output-format stream-json \
--safe-mode --setting-sources '' --no-session-persistence \
--tools Read --permission-mode dontAsk --max-turns 3 \
--settings '{"permissions":{"deny":["Read(./blocked-read.txt)"]}}' \
-- 'Use the Read tool once on blocked-read.txt. Do not use another tool or retry. Then stop.'
)
```

There is one native `permissions.deny` rule and only Read is enabled. No OS sandbox profile is part of this reproduction. The temporary directory is intentionally left for inspection.

Inspect the stream for a Read `tool_use` targeting that file and pair its `tool_result` by `tool_use_id`. If the model declines without making the call, the run is inconclusive, not a reproduction.

## Expected

A rejected native deny-rule call has a correlated, typed report of the decision: for example a `system/permission_denied` event or a terminal `permission_denials` entry. A native `tool_result_meta` permission-rule indication would also make the error distinguishable from unrelated validation errors.

No change to blocking or deny-rule precedence is requested.

## Actual observation and versions

In the previously observed live Read case, the matching result has `is_error: true` and says the directory is denied by permission settings, but the Read call has no typed denial event, no permission-rule sidecar, and no terminal `permission_denials` entry.

- 2.1.260, native macOS arm64: observed live in an earlier synthetic test.
- 2.1.236 (`stable` at the time of inspection): static inspection of the official native macOS arm64 artifact found the same missing reporting path.
- 2.1.263 (`latest`/`next` at the time of inspection): static inspection found the same path.

The compact recipe above has not been run separately. The static findings are not presented as live reproductions on 2.1.236 or 2.1.263.

## Source-level finding

Read checks the explicit deny rule during input validation. That early return becomes a generic error tool result before the ordinary permission-denial reporting path. The requested improvement is to carry the already-made native deny decision into the typed output, without changing enforcement.

Trace the Read input-validation path described in the issue, where an explicit deny becomes a generic error tool result before the ordinary permission-denial reporting path. Run the minimal reproduction after understanding those paths, then verify that a blocked Read produces a correlated typed denial event or terminal permission_denials entry without changing enforcement or deny-rule precedence.

索引モデルが issue の本文から書いたものです。