Harness spec 3.4.0: progress phases, and subagents v2 — the main agent and its tree

progress.md: thirteen fixed phases (queued … failed), each { phase, since, data },
their texts as shared i18n keys (loop.json progress), one line every client draws,
sent beside the old status text in /api/v2 and over the link (capability progress).

subagents.md §5–§13 (supersedes team.md where they differ): only the main agent
adds, assigns, replaces, stops and decides; sub-managers direct those placed under
them; ids, positions, parents; Min above 1 opens slots; permissions inherited and
never widened, request options decided by the main agent, what nobody in the tree
can allow goes to the person; team_finish, findings, running out of context;
transcripts read-only; the tree over the link (capability tree). New tools
team_whoami, team_finish, team_findings, team_request, team_decide, team_assign,
team_replace. Conformance: progress, delegation; team updated.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

harness/tools/team_send.json

@@ -14,7 +14,7 @@
     "cli": [],
     "llembas": []
   },
-  "description": "Send a message through your team's room: to one or more agents by name, or to `all`. It reaches each at its next step, or wakes one that has finished, its context intact. Message the agent who owns a thing; use `all` only for what everyone needs. The team's lead is `lead`; your manager is reached by its name.",
+  "description": "Send a message through the team's room: to one or more agents by name, to `parent` (the agent you report to), or to `all`. It reaches each at its next step, or wakes one that has finished, its context intact. Message the agent who owns a thing; use `all` only for what everyone needs. The main agent is `lead`.",
   "parameters": {
     "type": "object",
     "properties": {
@@ -24,7 +24,7 @@
           "type": "string"
         },
         "minItems": 1,
-        "description": "Names, or [\"all\"]"
+        "description": "Names, [\"parent\"], or [\"all\"]"
       },
       "message": {
         "type": "string",