Ship a pia-vpn skill with the VPN support toggle

The toggle grants CAP_NET_ADMIN and /dev/net/tun and stops there, which users
reasonably read as "turn the VPN on" — the gap between the two is the reported
bug that the default network does not route through a VPN. Close it by giving
the container an agent-usable way to build the tunnel, rather than leaving
each project to rediscover it.

container/skills/ is baked to /opt/triple-c-skills and installed into
~/.claude/skills/ by entrypoint.sh from VPN_SUPPORT_ENABLED, mirroring how
Mission Control installs its own. Staged under /opt because ~/.claude is a
volume mount that would mask an image copy from first start.

Three details that are not incidental:

- The variable is sent as 0 rather than omitted when off, because ~/.claude
  persists: entrypoint has to be *told* to remove a skill left by an earlier
  run with the toggle on, and an absent variable cannot say that. A stale skill
  is worse than none, since it instructs an agent to use a capability the
  container no longer has.
- It is reserved in RESERVED_ENV_EXACT alongside MISSION_CONTROL_ENABLED, or a
  custom env var of the same name could claim the skill without the capability
  behind it. Covered by a test.
- The skill is re-copied on every start, rm -rf'd first, so fixes reach existing
  projects and files dropped from a later version do not linger.

The skill itself carries the three things that are easy to get wrong: that a
full tunnel captures the Docker resolver and takes DNS down with it, that an
IP-literal health check cannot see a dead resolver, and that no tunnel survives
a restart while /run state riding the snapshot makes it look as though one did.
It also states what it deliberately does not do — no killswitch, no autostart —
so an agent proposes those as decisions rather than improvising them.

pia-wg.sh preflights CAP_NET_ADMIN by capability bit rather than letting the
first `ip` call fail with a bare EPERM that points nowhere near the setting
that needs changing. Credentials stay in a file (~/pia-creds, PIA_CREDS to
override) rather than the environment, where docker inspect and every process
in the container would see them.

Tested: install/refresh/remove/no-op paths of install_feature_skill against the
real function; preflight with and without the capability; and a full up --full
/ down round trip, confirming DNS via PIA's resolvers, api.anthropic.com
reachable through the exit, and routes and resolv.conf restored on teardown.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

CLAUDE.md

@@ -340,6 +340,14 @@ container is created once by a very long function where a dropped capability is
   breaks split tunnels too; `openresolv` has no candidate on noble and `resolvconf` drags in
   systemd-resolved, so that one is documented rather than fixed. Driving `wg` and `ip route`
   directly avoids both, which is what the skill does.
+- **The `pia-vpn` skill is installed *and removed* from `VPN_SUPPORT_ENABLED`.** `container/skills/`
+  is baked to `/opt/triple-c-skills` and `install_feature_skill()` in `entrypoint.sh` copies it into
+  `~/.claude/skills/` on every start — refreshed each time, so a fix reaches existing projects, and
+  `rm -rf`'d first, so files dropped from a later version do not linger. The removal branch matters
+  as much as the install: `~/.claude` is a persisted volume, so a skill left behind after the toggle
+  goes off would keep instructing an agent to use a capability the container no longer has. Which is
+  also why the variable is sent as `0` rather than omitted, and why it is in `RESERVED_ENV_EXACT` —
+  a custom env var of that name could otherwise claim the skill without the capability behind it.
 
 ### Container Lifecycle