* Port from google-gemini/gemini-cli#21541: back up corrupted config.yaml
When config.yaml fails to parse, load_config() silently falls back to
DEFAULT_CONFIG and leaves the broken file on disk. If the user then re-runs
the setup wizard or hermes config set (both rewrite config.yaml), their
broken-but-recoverable overrides are lost for good.
Adapts the policy-file recovery from gemini-cli#21541: on the first parse
warning for a given broken file, snapshot it to config.yaml.corrupt.<ts>.bak
(best-effort, symlink-guarded, size-deduped) and tell the user where it
landed. Unlike Gemini's version we deliberately do NOT reset config.yaml to a
clean state — hermes never silently mutates user config, and leaving it means
a hand-fixed file is re-read on the next load.
Tests: 3 new cases (backup created + content preserved + original untouched;
same-size backup dedup; symlink not copied). E2E verified with isolated
HERMES_HOME and a real tab-indented broken config.
* feat(dashboard): add Debug Share to the System page
Surface `hermes debug share` in the dashboard. The System > Operations
section gets a dedicated card that uploads a redacted report + full logs
and returns the paste URLs as real, copyable links instead of a log tail.
- debug.py: factor a pure build_debug_share() returning structured
{urls, failures, redacted, auto_delete_seconds}; run_debug_share now
calls it (CLI output unchanged).
- web_server.py: POST /api/ops/debug-share runs the share core in a
worker thread and returns the structured payload synchronously (the
URLs are the whole point — not a backgrounded action).
- api.ts: runDebugShare() + DebugShareResponse.
- SystemPage.tsx: share card with a redaction toggle (on by default),
per-link + copy-all buttons, and the 6h auto-delete countdown.
- tests: build_debug_share core + endpoint (redact toggle, failure 502,
token gate).
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