bcli 0.4.0 — Agent Interface Profile v0.1

The Agent Interface Profile (AIP) v0.1 lands: a small kernel of CLI primitives any agent runtime can drive deterministically, without parallel schemas or hand-written MCP tools.

• bcli describe --format json projects the live Typer surface, registry, and profile as one canonical artifact.
• Mutation result envelope (--result-out PATH / --result-fd N) on every write — failures are diagnosable side-channel, no stdout scraping.
• Batch operation ledger — durable SQLite, survives SIGKILL. Three new commands: bcli batch state, bcli batch list, bcli batch rollback.
• Exit code taxonomy (0–8) replaces "non-zero = error"; agents key off specific codes.
• JSON on pipe by default — pipelines, redirects, CI all get machine-readable output without flag dance.
• --idempotency-key on writes + per-step idempotency_key: in batch YAML — same-run replay protection.
• bcli_mcp rewrote from 4 hand-written tools to 23 generated from bcli describe, including 5 new mutating verbs that return envelopes.
• Skills layer — bcli skill install projects saved queries and batch workflows as Claude Code slash commands; bcli skill init is an interactive wizard for per-user personalization. Entry-point group bcli.skill_init.role_templates lets downstream packages contribute role-tailored templates without forking bcli.

Breaking changes

Two intentional breaks (one-line migrations):

• Policy refusals (read-only profile + missing --yes) now exit 8 (was 1).
• MCP tool names match the CLI command path: query → bcli_get, list_endpoints → bcli_endpoint_list, etc. Migration table in docs/mcp-server.md.

Full changelog

See CHANGELOG.md for the full entry, including deferred-to-v0.5 items.