docs(W4): document contract — stamp kind and status on 104 live docs (#1350)

Co-authored-by: veronica <[email protected]>

docs/fleet/migration/example-profile-disposition.md

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 # Executable Fleet Example, Profile, and Service-Preset Dispositions
 
 **Issue:** #758 · **Card:** FCM-M1-003 · **Status:** M1 executable disposition evidence

docs/fleet/migration/legacy-class-aliases.md

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 # Legacy Fleet Class Aliases
 
 Fleet class compatibility is intentionally narrow. The shared resolver accepts exactly three legacy

docs/fleet/migration/v1-to-v2.md

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 # Previewing a Fleet Roster v1-to-v2 Migration
 
 **Issue:** #758 · **Card:** FCM-M4-001 · **Effect boundary:** preview only