refactor(orchestrate-herdr): orchestrator finds or starts planner

Rewrote the skill so the invoking session only discovers an existing
run or launches a fresh planner, then monitors via Herdr read-only
commands. Workers keep state in .orchestrate/<slug>/ with run.json and
events.jsonl; the tracker holds all handoffs and decisions. Re-invoking
the same command recovers monitoring after an orchestrator outage, and
an in-progress label plus atomic launch claims prevent duplicate
planners.

README.md

@@ -28,7 +28,7 @@ Many of these skills were created or originated by the following people and orga
 - [implement-spec](skills/engineering/implement-spec/SKILL.md) — Implement the result of /to-spec and /to-tickets in code.
 - [implementation-orchestrator](skills/engineering/implementation-orchestrator/SKILL.md) — Implements ready-for-agent tracker tickets through isolated worktrees, pull requests, review, conflict resolution, and merge. Use after wayfinder and planning have produced tickets, with or without a ticket ID/URL; no ticket ID/URL means process available tickets. Does not create planning tickets.
 - [improve-codebase-architecture](skills/engineering/improve-codebase-architecture/SKILL.md) — Scan a codebase for deepening opportunities, present them as a visual HTML report, then grill through whichever one you pick.
-- [orchestrate-herdr](skills/engineering/orchestrate-herdr/SKILL.md) — Drive a plan from context or @file through a published spec, linked tickets, and one-at-a-time isolated implementation to a merged PR using Herdr and Pi agents.
+- [orchestrate-herdr](skills/engineering/orchestrate-herdr/SKILL.md) — Start or monitor a Herdr/Pi planner for a published spec ticket; re-invoke after an orchestrator outage.
 - [project-context-pack](skills/engineering/project-context-pack/SKILL.md) — Use when the user wants a bounded repo context pack, project map, codebase index, or cached memory file so later work uses fd/rg/tree-sitter/LSP instead of repeated browsing.
 - [recipe-diagrams](skills/engineering/recipe-diagrams/SKILL.md) — Recipe diagrams: convert any recipe into a high-resolution Cooking for Engineers-style PNG process-flow table with aligned ingredient streams, preparation branches, joins, temperatures, timings, and finish steps. Use when the user asks for a recipe diagram.
 - [security-audit](skills/engineering/security-audit/SKILL.md) — Comprehensive security and correctness audit of a branch's changes. Use for deep review requests, or branch/PR diff audits focused on bugs, breaking changes, security issues, devex regressions, and feature-gate leaks.