refactor: hard-fork GSD -> MSD (Make Software Done)

Mechanical rename produced by scripts/msd-rename.cjs: gsd/Gsd/GSD -> msd/Msd/MSD
across contents and paths, upstream package/repo coordinates -> @golem15/msd-core
and golem15com/msd-core. Deep links into upstream history, sibling upstream
packages, the GSD-2 import feature, CHANGELOG.md and .changeset/ are kept as-is.

Hand edits on top: MSD block-letter banner and logos, LICENSE copyright line,
package/plugin identity, regenerated lockfile, install-tree fixtures, derived
registries and benchmark baseline; migration checksum baseline re-locked
(MSD keeps its own install state, so no install had applied the old sums);
sort-order and regex-escaped expectations in tests adjusted.

docs/features/spec-phase-edge-completeness-probe.md

@@ -4,7 +4,7 @@ title: Spec-Phase Edge-Completeness Probe
 group: v1.42.1 Features
 ---
 
-**Command:** `/gsd-spec-phase`
+**Command:** `/msd-spec-phase`
 
 **Purpose:** Surface the omitted domain-boundary edges that silently invalidate a requirement — touching intervals, empty inputs, rounding ties, grapheme truncation — before they become production defects. Runs as `Step 5.5` of spec-phase, after the ambiguity gate.
 
@@ -25,7 +25,7 @@ The resolved edges populate a `## Edge Coverage` section in `SPEC.md`. Unresolve
 
 The load-bearing wire is the `plan-phase` lift: `covered` and `backstop` edges become `must_haves.truths` the verifier can check, so the section is not merely documentation. A `backstop` edge is lifted as a **structured non-inferable marker** (`{ statement, verification: backstop }`, a flat scalar — not a prose note), which the **honest verifier** then consumes (see below) — closing the loop the edge-probe opened.
 
-**Honest verifier — abstention on non-inferable checks (#1154).** A non-inferable (`backstop`) truth is one whose correct behavior is not derivable from the spec alone, so the verifier cannot self-detect the gap and would confidently false-pass it (~100% of the time). At verify time, a `backstop` truth the verifier cannot confirm with **explicit evidence** (a passing wired held-out/property-based test, or a directly-observed behavior) **abstains** → `human_needed` with reason `insufficient_spec` (reported as `unverified — held-out test recommended`), **never a silent `passed`**. This is the verify-time, truth-axis mirror of the prohibition judgment-tier disposition (ADR-550 D4): exogenous (driven by the `backstop` tag, never a self-judged "abstain if unsure"), routing-not-diagnosis (the held-out test carries the omitted rule), and capable-tier dependent (reliable on `sonnet`+; the budget `haiku` tier degrades toward current behavior). An inferable truth is never abstained (the over-abstention guard). Reference: [Honest Verifier](../gsd-core/references/honest-verifier.md).
+**Honest verifier — abstention on non-inferable checks (#1154).** A non-inferable (`backstop`) truth is one whose correct behavior is not derivable from the spec alone, so the verifier cannot self-detect the gap and would confidently false-pass it (~100% of the time). At verify time, a `backstop` truth the verifier cannot confirm with **explicit evidence** (a passing wired held-out/property-based test, or a directly-observed behavior) **abstains** → `human_needed` with reason `insufficient_spec` (reported as `unverified — held-out test recommended`), **never a silent `passed`**. This is the verify-time, truth-axis mirror of the prohibition judgment-tier disposition (ADR-550 D4): exogenous (driven by the `backstop` tag, never a self-judged "abstain if unsure"), routing-not-diagnosis (the held-out test carries the omitted rule), and capable-tier dependent (reliable on `sonnet`+; the budget `haiku` tier degrades toward current behavior). An inferable truth is never abstained (the over-abstention guard). Reference: [Honest Verifier](../msd-core/references/honest-verifier.md).
 
 **Requirements:**
 - REQ-EDGE-01: The edge pass MUST run after the ambiguity gate and emit a `## Edge Coverage` SPEC section.
@@ -38,4 +38,4 @@ The load-bearing wire is the `plan-phase` lift: `covered` and `backstop` edges b
 - REQ-EDGE-08: `plan-phase` MUST lift a `backstop` edge into `must_haves.truths` as a structured flat-scalar marker (`{ statement, verification: backstop }`), never a prose parenthetical.
 - REQ-HONEST-01: At verify time a `backstop` truth that cannot be confirmed with explicit evidence MUST abstain → `human_needed` (reason `insufficient_spec`), never `passed`; an inferable truth MUST never be abstained (over-abstention guard); abstention MUST be exogenous (driven by the `backstop` tag, not self-judgment).
 
-**Reference:** [Edge Probe](../gsd-core/references/edge-probe.md)
+**Reference:** [Edge Probe](../msd-core/references/edge-probe.md)