feat: Add Boardwalk plugin

[daedboi]

Description

Adds the Boardwalk plugin (hybrid): drives the boardwalk CLI (@useboardwalk/sdk) to build unsigned calldata for send_calls, with a prefilled launch-link fallback when there's no shell. Boardwalk is a fee-protection token-launch platform (permanently-locked liquidity + a built-in swap-fee equivalent) — the CLI never signs, the user's Base Account does. Covers launch, contribute, claim, BMX stake/vote, fee/LP claims, and swap.

Website: https://www.useboardwalk.com/
X: https://x.com/useboardwalk

Type of change

• Base MCP plugin submission
• Update to an existing skill/plugin
• New skill
• Documentation
• Other (please describe):

Affected skill(s)

base-mcp

Plugin checklist

• Plugin spec/manifest is accurate and tested
• (If Applicable) API endpoints and/or external MCP/CLI tested and functional
• Follows Contribution Scope

Base MCP Plugin Submission Agreement (when applicable)

By checking the box below, I agree and represent on behalf of the protocol/entity it references that:

• I am authorized to submit this plugin on behalf of the protocol/entity it references;

• the plugin does not infringe or misappropriate any third party's rights;

• the plugin and the underlying protocol comply with all applicable laws, and my API enforces the same geofencing and eligibility restrictions as my own user-facing app;

• the plugin is in full compliance with our protocol's/entity's then-current terms and conditions, and if not, submission and use thereafter is considered a formal written exemption to such terms and conditions;

• the plugin accurately describes its behavior and contains no hidden, deceptive, or malicious instructions, and my API will not return malicious or unexpected calldata;

• the protocol/entity is solely responsible for the plugin and is submitting a plugin is subject to the Base Account and Base App Terms of Service as using a "Service"; and

• Base may modify, decline to list, or remove the plugin at any time, for any reason.

• I have read and agree to the Base MCP Plugin Submission Agreement above.

Related issues

[cb-heimdall]

🟡 Heimdall Review Status

Requirement	Status	More Info
Reviews	🟡 0/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1