docs: align repo with contributor ladder and update rosters

.github/ISSUE_TEMPLATE/maintainer-nomination.md

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+---
+name: Maintainer Nomination
+about: Nominate a Member to become a Maintainer of the Transports Working Group.
+title: 'Maintainer Nomination: @[username]'
+labels: ['nomination', 'maintainer']
+assignees: ''
+---
+
+**Nominee:** @[GitHub handle]
+**Scope:** Transports Working Group
+**Sponsor:** @[GitHub handle, must be Maintainer or Core Maintainer]
+
+**Requirements:**
+- [ ] Member for 6+ months with sustained, high-quality contributions
+- [ ] Links to demonstrated leadership in WG or significant initiatives
+- [ ] Evidence of representing MCP's interests above employer/organization interests
+- [ ] Deep understanding of MCP vision, roadmap, and design principles
+- [ ] Security and governance onboarding completed (or scheduled)
+
+**Core Maintainer Approval:**
+- [ ] Approved by Core Maintainers

.github/ISSUE_TEMPLATE/member-nomination.md

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+---
+name: Member Nomination
+about: Nominate a contributor to become a Member of the Transports Working Group.
+title: 'Member Nomination: @[username]'
+labels: ['nomination', 'member']
+assignees: ''
+---
+
+**Nominee:** @[GitHub handle]
+**Sponsors:** @[GitHub handles]
+**Organizations represented:** [Must be 2+ different orgs among sponsors, or 1 Core/Lead Maintainer]
+
+**Contributions:**
+- [ ] Link to merged PR(s)
+- [ ] Link to issues filed/triaged
+- [ ] Link to discussions participated in
+- [ ] Duration of participation: [X months]
+
+**Sponsor Attestations:**
+- [ ] Sponsors confirm nominee demonstrates community values
+- [ ] Sponsors confirm nominee demonstrates sustained engagement