docs/commands.md not synced with the 3.1.0 actionability gate (Parked / Needs-diagnosis groups, abort-before-egress, non-routable Complexity row)

[kiki830621]

Problem

docs/commands.md was not updated for the actionability gate shipped in 3.1.0 (#316): the /idd-list section (~L117-134) does not mention the gate or the Parked / Needs diagnosis groups, the /idd-implement section does not say a parked or blocked issue now aborts before any branch or comment is created, and the Complexity table (~L252) still has only the three "verdict → next step" rows with no row for a non-routable value. User-facing docs and behaviour have diverged.

Source

• Verify report on PR feat: actionability gate round 2 — prefix tier + deferral vocabulary, wired into all four consumers (#316) #318 (round 2), finding 22 (regression L6).
• Canonical contract: plugins/issue-driven-dev/references/actionability-gate.md.

Expected

docs/commands.md describes, in one paragraph per consumer, what the gate withholds, what the operator sees (reason + surfaced raw value), and the human remedies (apply/remove parking-lot, clear ### Blocking via idd-update, run /idd-diagnose). The Complexity table gains a "non-routable" row pointing at the reference.

Acceptance criteria

• /idd-list, /idd-implement, /idd-plan, /idd-all sections mention the gate
• Complexity table has a non-routable row
• idd-close Step 6.3 doc-sync sweep passes for docs/commands.md

Complexity

Simple — documentation only.