v0.16.4

Highlights

Bug fixes:

• Session metadata is written atomically now. A process killed mid-write used to leave a truncated state.json, and the next resume silently fell back to default metadata, losing the session's whole agent topology.
• The web server no longer turns malformed percent-encoding in session URLs into an unhandled rejection that can crash the process; undecodable session ids get a plain 404.

Rendering and polish:

• Markdown headings get a bright amber signature color, and the fluorescent brand green is now the only green in markdown: inline code is back to the raw accent, code-block strings join the heading amber, and diff additions use the accent as well.
• The activity block header shows an aggregate diff of the group's successful edits and writes (+22 -21) and drops the unreliable token estimate; the rate slot carries a label so it still reads as a measured speed.
• The /blockrows collapsed-height options are retuned to 3, 5 and 8, and a truncated thinking row keeps one cell of breathing room before the ellipsis instead of running edge to edge.

Version: all workspace packages bumped to 0.16.4.

Validation

• Full repository suite: 552 files, 6,961 tests passed, no failures; typecheck clean.
• Changes passed adversarial review passes before landing.