* feat(mcp): raise default tool-call timeout 120s -> 300s
Port from openai/codex#28234. Long-running MCP tools (web fetches,
sandboxed builds, deep-research servers) routinely exceed 120s, causing
spurious timeout failures. Codex bumped its default MCP tool timeout from
120 to 300 for the same reason.
- _DEFAULT_TOOL_TIMEOUT 120 -> 300 in tools/mcp_tool.py (per-server
'timeout' config override unchanged)
- update test_default_timeout assertion
- document the default in mcp-config-reference.md
* fix(dump): show commit date instead of release date in hermes dump
The version line in `hermes dump` (the top of the /debug report) appended
the package release date in parentheses, which reads like a wall-clock
"generated at" timestamp and confuses support triage. Replace it with the
date the HEAD commit was actually made, resolved live via
`git log -1 --format=%cd --date=short`, kept next to the commit SHA.
On Docker/wheel installs with no .git the date resolves to '' and the
suffix is simply omitted (the baked SHA still identifies the build).
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