chore(release): bump workspace version 0.7.1 -> 0.7.2

[hartsock]

What this PR does

Cuts agent-bridle 0.7.2: bumps [workspace.package] version, the four
internal lock-step pins, and agent-bridle-gateway's standalone version
(0.7.1 → 0.7.2), plus Cargo.lock (workspace members only). Tag v0.7.2
after merge to trigger the release workflow (crates.io matrix + binaries).

0.7.2 ships everything merged since the 0.7.1 bump:

• presence + traffic web console MVP, mocked mesh (feat(gateway): presence + traffic web console (MVP, mocked mesh) #215)
• net_proxy tests driven over in-memory seams, not real sockets (test(net-proxy): restore generous audit-poll deadline (fix over-tightened #165 bound) #166, test(net_proxy): mock the socket seam — deterministic in-memory proxy tests (#166) #216)
• LLM flight recorder + WebAuthn presence + mesh discharge design plan (docs(design): LLM flight recorder + WebAuthn presence + mesh discharge plan #214)

Published crates (core, tool-shell, tool-web, facade, mcp) have no API
changes; downstream "0.7" pins (newt-agent) pick this up with no manifest
change.

Test plan

• Publish matrix pre-flighted against cargo metadata from main: topological
  order valid, and no published crate has a path-only (version-less) internal
  dep — the failure class that broke newt-agent v0.7.2 today.
• agent-bridle-gateway (new in feat(gateway): presence + traffic web console (MVP, mocked mesh) #215) is unpublished and nothing published
  depends on it; it carried a hardcoded version = "0.7.1", bumped here in
  lock-step. Converting it to version.workspace = true is a follow-up.
• Pre-push hook passed on push; PR CI runs the same tier.

🤖 Generated with Claude Code

https://claude.ai/code/session_01U3LeKBnJvMtHBp9vESiTzs