Per-chain bundle-size budgets and CI gate

[truthixify]

Tier: M (2-4 days) | Type: perf

Context. package.json size-limit today gates only dist/chains/stellar/* at 20 KB (see PR #89). EVM, Solana, CKB, /vault, and the root agent entry can drift arbitrarily large between PRs. With v1.0 shipped, we lock a budget per public entry and fail CI when a change blows it.

Scope.

• Add size-limit blocks for every entry in package.json exports (evm, solana, ckb, vault, root).
• Budgets chosen from the current baseline plus 15 percent headroom.
• CI job pnpm size runs on every PR touching src/.
• Update BUNDLE_SIZE.md with the full table and the tool commands.

Acceptance.

• All five new entries have documented budgets in package.json
• pnpm size blocks PRs that exceed any budget
• BUNDLE_SIZE.md regenerated with real numbers, not TBD placeholders
• One deliberate over-budget PR verifies the gate fires

Files. package.json, BUNDLE_SIZE.md, .github/workflows/ci.yml.

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