refactor(#3309): consolidate adviseRemedy() into the shared types leaf

adviseRemedy() was defined identically in two of the eight rule-group
files (config-validation.cts, agent-install.cts) while the other six
repeated the same {action: ADVISE, risk: NONE, args: {command}} object
literal inline ~20+ times. Found by the Standards-axis orthogonal
review (Duplicated Code smell).

Moves the one-line helper into health-diagnostic-types.cts, the leaf
module every rule-group file already imports for its enums/types, and
uses it consistently across all 8 files. Pure mechanical refactor — no
ADVISE remedy's command text, code, or action changed.

src/health-diagnostic-rules/agent-install.cts

@@ -26,10 +26,9 @@
 
 // eslint-disable-next-line @typescript-eslint/no-require-imports -- health-diagnostic-types.cjs is an export= CommonJS module
 import healthDiagnosticMod = require('../health-diagnostic-types.cjs');
-const { SEVERITY, REMEDY_ACTION, REMEDY_RISK } = healthDiagnosticMod;
+const { SEVERITY, adviseRemedy } = healthDiagnosticMod;
 type Rule = healthDiagnosticMod.Rule;
 type Diagnostic = healthDiagnosticMod.Diagnostic;
-type Remedy = healthDiagnosticMod.Remedy;
 
 // eslint-disable-next-line @typescript-eslint/no-require-imports -- type-only; erased at compile time, no runtime require emitted
 import type planningSnapshotMod = require('../planning-snapshot.cjs');
@@ -41,10 +40,6 @@ const { SCOPE } = planningScopeMod;
 
 import { PACKAGE_NAME } from '../package-identity.cjs';
 
-function adviseRemedy(command: string): Remedy {
-  return { action: REMEDY_ACTION.ADVISE, risk: REMEDY_RISK.NONE, args: { command } };
-}
-
 /**
  * `check(snapshot)` for W010 — see module header for the exact 4-way
  * branching this ports from `verify.cts:1992-2027`, and its message/fix

src/health-diagnostic-rules/config-validation.cts

@@ -56,9 +56,8 @@ type PlanningSnapshot = ReturnType<typeof planningSnapshotMod.buildPlanningSnaps
 
 // eslint-disable-next-line @typescript-eslint/no-require-imports -- health-diagnostic-types.cjs is an export= CommonJS module
 import healthDiagnosticMod = require('../health-diagnostic-types.cjs');
-const { SEVERITY, REMEDY_ACTION, REMEDY_RISK } = healthDiagnosticMod;
+const { SEVERITY, REMEDY_ACTION, REMEDY_RISK, adviseRemedy } = healthDiagnosticMod;
 type Diagnostic = healthDiagnosticMod.Diagnostic;
-type Remedy = healthDiagnosticMod.Remedy;
 type Rule = healthDiagnosticMod.Rule;
 
 import { VALID_PROFILES, VALID_TIERS, VALID_PHASE_TYPES } from '../model-catalog.cjs';
@@ -66,10 +65,6 @@ import { VALID_PROFILES, VALID_TIERS, VALID_PHASE_TYPES } from '../model-catalog
 // verify.cts:2141 — inlined literal, not exported from anywhere; same list.
 const VALID_BRANCHING_STRATEGIES = ['none', 'phase', 'milestone'];
 
-function adviseRemedy(command: string): Remedy {
-  return { action: REMEDY_ACTION.ADVISE, risk: REMEDY_RISK.NONE, args: { command } };
-}
-
 // ─── W003 — config.json not found (verify.cts:1777-1785) ───────────────────
 
 function checkW003(snapshot: PlanningSnapshot): Diagnostic[] {

src/health-diagnostic-rules/milestone-archive-hygiene.cts

@@ -23,7 +23,7 @@ type PlanningSnapshot = ReturnType<typeof planningSnapshotMod.buildPlanningSnaps
 
 // eslint-disable-next-line @typescript-eslint/no-require-imports
 import healthDiagnosticMod = require('../health-diagnostic-types.cjs');
-const { SEVERITY, REMEDY_ACTION, REMEDY_RISK } = healthDiagnosticMod;
+const { SEVERITY, REMEDY_ACTION, REMEDY_RISK, adviseRemedy } = healthDiagnosticMod;
 type Diagnostic = healthDiagnosticMod.Diagnostic;
 type Rule = healthDiagnosticMod.Rule;
 
@@ -85,14 +85,9 @@ function checkW019(snapshot: PlanningSnapshot): Diagnostic[] {
       code: 'W019',
       severity: SEVERITY.WARNING,
       message: `Unrecognized .planning/ file: ${filename} — not a canonical GSD artifact`,
-      remedy: {
+      remedy: adviseRemedy(
-        action: REMEDY_ACTION.ADVISE,
+        'Move to .planning/milestones/ archive subdir or delete if stale. See templates/README.md for the canonical artifact list.',
-        risk: REMEDY_RISK.NONE,
+      ),
-        args: {
-          command:
-            'Move to .planning/milestones/ archive subdir or delete if stale. See templates/README.md for the canonical artifact list.',
-        },
-      },
     });
   }
   return diagnostics;

src/health-diagnostic-rules/phase-structure.cts

@@ -55,7 +55,7 @@ type PlanningSnapshot = ReturnType<typeof planningSnapshotMod.buildPlanningSnaps
 
 // eslint-disable-next-line @typescript-eslint/no-require-imports
 import healthDiagnosticMod = require('../health-diagnostic-types.cjs');
-const { SEVERITY, REMEDY_ACTION, REMEDY_RISK } = healthDiagnosticMod;
+const { SEVERITY, adviseRemedy } = healthDiagnosticMod;
 type Diagnostic = healthDiagnosticMod.Diagnostic;
 type Rule = healthDiagnosticMod.Rule;
 
@@ -77,11 +77,7 @@ function checkW005(snapshot: PlanningSnapshot): Diagnostic[] {
         code: 'W005',
         severity: SEVERITY.WARNING,
         message: `Phase directory "${name}" doesn't follow NN-name format`,
-        remedy: {
+        remedy: adviseRemedy('Rename to match pattern (e.g., 01-setup)'),
-          action: REMEDY_ACTION.ADVISE,
-          risk: REMEDY_RISK.NONE,
-          args: { command: 'Rename to match pattern (e.g., 01-setup)' },
-        },
       });
     }
   }
@@ -127,14 +123,9 @@ function checkW023(snapshot: PlanningSnapshot): Diagnostic[] {
       code: 'W023',
       severity: SEVERITY.WARNING,
       message: `Phase directories collide on normalized key "${key}": ${described}`,
-      remedy: {
+      remedy: adviseRemedy(
-        action: REMEDY_ACTION.ADVISE,
+        'Inspect each directory; rename or remove the duplicate so only one directory maps to this phase key',
-        risk: REMEDY_RISK.NONE,
+      ),
-        args: {
-          command:
-            'Inspect each directory; rename or remove the duplicate so only one directory maps to this phase key',
-        },
-      },
     });
   }
   return diagnostics;
@@ -161,11 +152,7 @@ function checkI001(snapshot: PlanningSnapshot): Diagnostic[] {
         code: 'I001',
         severity: SEVERITY.INFO,
         message: `Phase ${phase.dir} has ${deficit} plan(s) without a matching summary`,
-        remedy: {
+        remedy: adviseRemedy('May be in progress'),
-          action: REMEDY_ACTION.ADVISE,
-          risk: REMEDY_RISK.NONE,
-          args: { command: 'May be in progress' },
-        },
       });
     }
   }
@@ -183,11 +170,7 @@ function checkW009(snapshot: PlanningSnapshot): Diagnostic[] {
         code: 'W009',
         severity: SEVERITY.WARNING,
         message: `Phase ${entry.dir}: has Validation Architecture in RESEARCH.md but no VALIDATION.md`,
-        remedy: {
+        remedy: adviseRemedy('Re-run /gsd-plan-phase with --research to regenerate'),
-          action: REMEDY_ACTION.ADVISE,
-          risk: REMEDY_RISK.NONE,
-          args: { command: 'Re-run /gsd-plan-phase with --research to regenerate' },
-        },
       });
     }
   }

src/health-diagnostic-rules/roadmap-disk-consistency.cts

@@ -88,7 +88,7 @@ type PlanningSnapshot = ReturnType<typeof planningSnapshotMod.buildPlanningSnaps
 
 // eslint-disable-next-line @typescript-eslint/no-require-imports
 import healthDiagnosticMod = require('../health-diagnostic-types.cjs');
-const { SEVERITY, REMEDY_ACTION, REMEDY_RISK } = healthDiagnosticMod;
+const { SEVERITY, adviseRemedy } = healthDiagnosticMod;
 type Diagnostic = healthDiagnosticMod.Diagnostic;
 type Rule = healthDiagnosticMod.Rule;
 
@@ -158,11 +158,7 @@ function checkW006(snapshot: PlanningSnapshot): Diagnostic[] {
       code: 'W006',
       severity: SEVERITY.WARNING,
       message: `Phase ${phaseId} in ROADMAP.md but no directory on disk`,
-      remedy: {
+      remedy: adviseRemedy('Create phase directory or remove from roadmap'),
-        action: REMEDY_ACTION.ADVISE,
-        risk: REMEDY_RISK.NONE,
-        args: { command: 'Create phase directory or remove from roadmap' },
-      },
     });
   }
   return diagnostics;
@@ -205,11 +201,7 @@ function checkW007(snapshot: PlanningSnapshot): Diagnostic[] {
       code: 'W007',
       severity: SEVERITY.WARNING,
       message: `Phase ${token} exists on disk but not in ROADMAP.md`,
-      remedy: {
+      remedy: adviseRemedy('Add to roadmap or remove directory'),
-        action: REMEDY_ACTION.ADVISE,
-        risk: REMEDY_RISK.NONE,
-        args: { command: 'Add to roadmap or remove directory' },
-      },
     });
   }
   return diagnostics;

src/health-diagnostic-rules/root-existence.cts

@@ -35,7 +35,7 @@ type PlanningSnapshot = ReturnType<typeof planningSnapshotMod.buildPlanningSnaps
 
 // eslint-disable-next-line @typescript-eslint/no-require-imports
 import healthDiagnosticMod = require('../health-diagnostic-types.cjs');
-const { SEVERITY, REMEDY_ACTION, REMEDY_RISK } = healthDiagnosticMod;
+const { SEVERITY, REMEDY_ACTION, REMEDY_RISK, adviseRemedy } = healthDiagnosticMod;
 type Diagnostic = healthDiagnosticMod.Diagnostic;
 type Rule = healthDiagnosticMod.Rule;
 
@@ -52,11 +52,7 @@ function checkE002(snapshot: PlanningSnapshot): Diagnostic[] {
       code: 'E002',
       severity: SEVERITY.ERROR,
       message: 'PROJECT.md not found',
-      remedy: {
+      remedy: adviseRemedy('/gsd-new-project'),
-        action: REMEDY_ACTION.ADVISE,
-        risk: REMEDY_RISK.NONE,
-        args: { command: '/gsd-new-project' },
-      },
     },
   ];
 }
@@ -86,11 +82,7 @@ function checkE003(snapshot: PlanningSnapshot): Diagnostic[] {
       code: 'E003',
       severity: SEVERITY.ERROR,
       message: 'ROADMAP.md not found',
-      remedy: {
+      remedy: adviseRemedy('/gsd-new-milestone'),
-        action: REMEDY_ACTION.ADVISE,
-        risk: REMEDY_RISK.NONE,
-        args: { command: '/gsd-new-milestone' },
-      },
     },
   ];
 }
@@ -161,11 +153,7 @@ function checkW001(snapshot: PlanningSnapshot): Diagnostic[] {
         code: 'W001',
         severity: SEVERITY.WARNING,
         message: `PROJECT.md missing section: ${required}`,
-        remedy: {
+        remedy: adviseRemedy('Add section manually'),
-          action: REMEDY_ACTION.ADVISE,
-          risk: REMEDY_RISK.NONE,
-          args: { command: 'Add section manually' },
-        },
       });
     }
   }

src/health-diagnostic-rules/state-consistency.cts

@@ -43,7 +43,7 @@
 // `planning-snapshot.cjs`, which never touches that module's runtime values.
 // eslint-disable-next-line @typescript-eslint/no-require-imports -- export= CommonJS module
 import healthDiagnosticMod = require('../health-diagnostic-types.cjs');
-const { SEVERITY, REMEDY_ACTION, REMEDY_RISK } = healthDiagnosticMod;
+const { SEVERITY, adviseRemedy } = healthDiagnosticMod;
 type Rule = healthDiagnosticMod.Rule;
 type Diagnostic = healthDiagnosticMod.Diagnostic;
 
@@ -161,14 +161,9 @@ const RULE_W002: Rule = {
         code: 'W002',
         severity: SEVERITY.WARNING,
         message: `STATE.md references phase ${ref}, but only phases ${sortedValid.join(', ')} are declared`,
-        remedy: {
+        remedy: adviseRemedy(
-          action: REMEDY_ACTION.ADVISE,
+          'Review STATE.md manually before changing it; /gsd-health --repair will not overwrite an existing STATE.md for phase mismatches',
-          risk: REMEDY_RISK.NONE,
+        ),
-          args: {
-            command:
-              'Review STATE.md manually before changing it; /gsd-health --repair will not overwrite an existing STATE.md for phase mismatches',
-          },
-        },
       });
     }
     return diagnostics;
@@ -210,11 +205,7 @@ const RULE_W011: Rule = {
         code: 'W011',
         severity: SEVERITY.WARNING,
         message: `STATE.md says current phase is ${phaseId} (status: ${statusVal || 'unknown'}) but ROADMAP.md shows it as [x] complete — state files may be out of sync`,
-        remedy: {
+        remedy: adviseRemedy('Run /gsd-progress to re-derive current position, or manually update STATE.md'),
-          action: REMEDY_ACTION.ADVISE,
-          risk: REMEDY_RISK.NONE,
-          args: { command: 'Run /gsd-progress to re-derive current position, or manually update STATE.md' },
-        },
       },
     ];
   },
@@ -243,11 +234,7 @@ const RULE_W021: Rule = {
         code: 'W021',
         severity: SEVERITY.WARNING,
         message: `Phase ${entry.phaseId}: integer prefix implies ${expectedMilestone} but listed under ${entry.milestone}`,
-        remedy: {
+        remedy: adviseRemedy('gsd-tools roadmap upgrade --convention milestone-prefixed'),
-          action: REMEDY_ACTION.ADVISE,
-          risk: REMEDY_RISK.NONE,
-          args: { command: 'gsd-tools roadmap upgrade --convention milestone-prefixed' },
-        },
       });
     }
     return diagnostics;
@@ -283,13 +270,9 @@ const RULE_W026: Rule = {
         code: 'W026',
         severity: SEVERITY.WARNING,
         message: `STATE says milestone complete but ROADMAP lists ${unstarted.length} unstarted phase(s) (e.g. Phase ${unstarted[0]})`,
-        remedy: {
+        remedy: adviseRemedy(
-          action: REMEDY_ACTION.ADVISE,
+          'Run validate consistency or re-run complete-milestone after verifying all phases are done',
-          risk: REMEDY_RISK.NONE,
+        ),
-          args: {
-            command: 'Run validate consistency or re-run complete-milestone after verifying all phases are done',
-          },
-        },
       },
     ];
   },

src/health-diagnostic-types.cts

@@ -80,12 +80,27 @@ interface Rule {
   check: (snapshot: PlanningSnapshot) => Diagnostic[]; // §8.1 rule 1 signature, verbatim
 }
 
+// ─── adviseRemedy — shared ADVISE-remedy builder ───────────────────────────
+
+/**
+ * Every rule-group file needs the same `{action: ADVISE, risk: NONE, args:
+ * {command}}` shape for a non-repairable finding's `fix` string (§8.3 rule
+ * 5). Was defined identically in `config-validation.cts` and
+ * `agent-install.cts`, and repeated inline elsewhere — moved to this shared,
+ * dependency-free leaf so every rule-group file imports one implementation
+ * instead of duplicating it.
+ */
+function adviseRemedy(command: string): Remedy {
+  return { action: REMEDY_ACTION.ADVISE, risk: REMEDY_RISK.NONE, args: { command } };
+}
+
 // ─── Exports ────────────────────────────────────────────────────────────────
 
 const healthDiagnosticTypes = {
   SEVERITY,
   REMEDY_ACTION,
   REMEDY_RISK,
+  adviseRemedy,
 };
 
 // Namespace merge (same binding name as the value above) is how a CommonJS