feat: forward build args to TSX recipes

[quick-ricon]

Summary

• forward extra wp build arguments to WALLPAPERS.tsx via Bun.argv.slice(2), matching the emails compose TSX pattern
• parse build's own flags from the actual argv instead of inherited usage_* env vars
• document wp build --set quick as recipe-owned argument handling

This means the tool only forwards args; each TSX file defines what flags like --set quick mean.

Verification

• mise run test (29/29)
• swift test (5/5)
• codebase lint:mise-settings "$PWD"
• codebase lint:bats-test-task "$PWD"
• codebase lint:bats-test-helper "$PWD"
• codebase lint:mcr-scope "$PWD"
• codebase lint:or-true "$PWD"
• codebase lint:shellcheck "$PWD"
• bash -n .mise/tasks/build test/build.bats
• shellcheck -x .mise/tasks/build
• git diff --check
• mise run readme

[zeke-ricon]

Looks good. I verified the build task now parses actual argv instead of inherited usage_* env, forwards recipe args after -- into the TSX runtime, and rewrites Bun.argv/process.argv so recipes can consume Bun.argv.slice(2).\n\nVerified locally:\n- mise run test (29/29)\n- mise run readme && git diff --exit-code README.md README.tsx\n- bash -n .mise/tasks/build test/build.bats

[brownie-ricon]

Approved. I checked the actual diff around the wp build boundary and the TSX runtime argv handoff.

What I verified:

• .mise/tasks/build now derives --source, --out, and --check from the task argv instead of inherited usage_*, and forwards only leftover recipe args after a -- sentinel to the runtime.
• tsx-runtime/build.ts rewrites Bun.argv/process.argv before importing the recipe, so recipe code sees Bun.argv.slice(2) as its own args rather than the build wrapper args.
• Regression coverage includes inherited usage_* leakage and recipe arg forwarding.

Local verification:

• mise run test (29/29)
• bash -n .mise/tasks/build test/build.bats
• shellcheck -x .mise/tasks/build
• git diff --check origin/main...HEAD
• mise run readme left README clean, but rewrote mise.lock formatting locally; I reverted that generated lockfile churn before review.

Degraded checks: swift test still fails on this Linux runner because CoreGraphics is unavailable, and my installed codebase shim is stale (0.1.0) and lacks the newer lint tasks listed in the PR. GitHub CI is green, including Quick's full verification path.