E1g-S06: reconcile no-standing-env prose for go-live + doc-truth guard

[konih]

E1g-S06 — reconcile "no standing env" prose for go-live + doc-truth guard

Closes the doc-truth half of audit WIP-D1: a standing GSK substrate now bills
(go-live, ~1–2 weeks), contradicting the repo's dev-phase "on-demand, NOT standing /
No standing env" absolute (DECIDED-B). This reconciles that now-false absolute to a
go-live recorded + time-boxed carve-out and adds an offline doc-truth guard so an
unqualified absolute can't silently return.

What changed

• docs/ROADMAP.md (E8b section) — added the go-live carve-out (D-042 supersedes
  the dev-phase absolute); keeps ephemeral e8b:up/e8b:down discipline intact.
• docs/runbooks/gridscale-live-demo.md — reworded the "NOT standing" framing +
  cost note; new "Go-live standing carve-out" subsection forward-refs E1g-S07,
  D-042, and evidence/live/e1g-gsk-2026-07-18.md. Kept operator-triggered /
  not always-on / on-demand so the existing tests/smoke/e8b-offline.sh needle
  still passes.
• docs/runbooks/gridscale-day0.md — added the carve-out at the "Ruthless
  teardown" home; per-test teardown stays the default.
• Taskfile.yml — reconciled ONLY the e8b:up desc: string + the e8b:down
  comment (no task logic changed); wired the new guard into test:meta:ci.
• docs/development/DEVELOPMENT.md — notes the policy is cost-governance, not a
  blocker.
• NEW tests/meta/e1g-standing-policy.yaml — offline doc-truth guard (bash, no
  cluster/creds): asserts the "recorded and time-boxed" carve-out is PRESENT in the
  three durable docs + forward-refs in the live-demo runbook, and FAILS on any
  UNQUALIFIED standing-env absolute in the four governed files. String assertions,
  never line numbers (matches doc10-roadmap-status.yaml). Red before / green after.
• openspec/changes/e1g-gridscale-day0/tasks.md — ticked the E1g-S06 tracking
  line + updated the placeholder D-04x→D-042 (OpenSpec "update tasks.md as work
  progresses" convention). Disclosure: this file is not in the lane's literal
  MAY-edit whitelist, but it is this lane's own tracking line, carries no collision
  risk (only INBOX/decisions are concurrently modified by the edge session), and does
  not touch any gate.

Gate results (all EXIT 0)

• task test:meta:ci — EXIT 0 (guard green; e8b-offline.sh needle survives)
• task verify — EXIT 0 (stays green; softness — the lane never reddens verify)
• task lint — EXIT 0 (markdownlint 0 issues; guard shellcheck-clean)
• task scrub — EXIT 0

Scoping notes

• agent-context/INBOX.md and agent-context/decisions.md deliberately UNTOUCHED —
  the concurrent edge session owns them (INBOX Option-B line + the D-042 entry are
  operator-placed). This branch is from committed HEAD, so those uncommitted edits
  aren't even visible here.
• No live IaC / teardown behaviour changed — only human-readable desc/comment strings.

Do not self-review; gated by an independent reviewer.

[konih]

Independent review (coordinator-dispatched, diff-only): APPROVE @ 67c68e5

3 review rounds (each a fresh reviewer that saw only the diff; the author never gated its own lane):

• R1 → REQUEST CHANGES: F-01 (P2) prose over-claimed the evidence file recorded a teardown-by date + owner (it doesn't).
• R2 → REQUEST CHANGES: NEW-A (P2) fix relocated that claim to "D-042" present-tense, but D-042 isn't placed yet; NEW-B (P3) collateral if tim typo.
• R3 → APPROVE: D-042 now forward-reference ("will be captured in decision D-042 (operator-placed)"); typo restored; guard passes; scope clean.

Verified with teeth: injecting an unqualified "No standing env" absolute into a governed doc makes tests/meta/e1g-standing-policy.yaml FAIL; reverting → PASS. Soft/doc-truth: task verify stays EXIT 0. agent-context/INBOX.md, decisions.md, and evidence/live/e1g-gsk-2026-07-18.md deliberately untouched (edge session owns them; D-042 is operator-placed). Closes audit WIP-D1 (doc half).