feat(codemode): unify parallel() calling convention with the sequential ns.tool() form

[revitteth]

What

parallel() now accepts bound tool references in the same call form as the sequential path, in addition to the legacy string descriptor:

// New — matches how you already call tools sequentially:
parallel([[github.list_issues, {repo}], [linear.search, {query}]]);   // [fn, args] tuple
parallel([{tool: github.list_issues, args: {repo}}, ...]);            // object form, bound ref

// Still works (backward compatible):
parallel([{tool: "github__list_issues", args: {repo}}, ...]);        // legacy string

Why

The concurrent path required a separate string-descriptor convention that diverged from the natural ns.tool(args) sequential form. That mismatch is a recurring agent error source (wrong __ name, args nested wrong) and a second mental model for "call a tool." Unifying them means the multi-call path reads like the one-call path.

How

• Each tool function is tagged with its canonical ns__name in a hidden (non-enumerable, non-writable) own property (tagToolFunc). parallel() recovers the name from a passed reference and dispatches via the same Go-goroutine concurrency as before — real concurrency is preserved; only the surface changes.
• parseParallelArgs walks the live Goja values (not Export(), which erases the tag) to classify tuple vs object items and resolve the tool slot (function or string) and args.
• Bonus consistency fix: no-arg parallel calls now send {} (matching the sequential marshalToolArgs) instead of null, in both dispatch and the audit record — a downstream tool expecting an object could reject null.
• help() and both execute_code tool descriptions advertise the new form.

Tests

• Bound tuple / object / mixed-batch dispatch with arg round-trip assertions
• Non-tool closure rejected with an actionable message
• Hidden tag invisible to Object.keys()
• No-arg {} normalization
• All existing string-descriptor tests unchanged (backward compat)

Isolated build (go build -tags p2p ./...) and go test ./internal/codemode/ green.

🤖 Generated with Claude Code

https://claude.ai/code/session_01MW9JEiRKg9zVffe14ybKGm