Migrating to v0.3.0

v0.3.0 is a major refactor of reqsh's internals (new lexer, parser and AST, split executor, reworked session management) and introduces several breaking command changes. The old header <key> <value>, unset, vars, headers and bare save/run/requests commands no longer exist, every session command now has an explicit, scoped form.

Command Changes

Old (v0.2.x)	New (v0.3.0)
`header <key> <value>`	`header set <key> <value>`
`headers`	`header list`
`unset header <key>`	`header remove <key>`
`vars`	`var list`
`unset <name>`	`var remove <name>`
`requests`	`req list`
`save <name>`	`req save <name>`
`run <name>`	`req run <name>`
`rename <old> <new>`	`req rename <old> <new>`
`rerun <id>`	`history rerun <id>`
`clear`	`clear` (terminal only)

Behaviour Changes

clear no longer resets session state. It only clears the terminal screen. Use the scoped commands instead: header clear, var clear, req clear, history clear.
History commands are namespaced under history: history (or history list), history show <id>, history rerun <id>, history clear.
The response now prints the request line (method + resolved URL) above the response headers.
Connection errors are friendlier. Failures like "connection refused", "could not resolve host" and "request timed out" are reported as concise messages instead of raw transport errors.
base validates the URL immediately. Setting an invalid base URL now fails with an error instead of waiting until the first request.

New in v0.3.0

req rerun - re-run the last executed request.
req show <name> - view a saved request's definition.
req clear - remove all saved requests.
req save-response <path> - save the last response body to a file.
history show <id> and history clear.
exit command to leave the shell.

State File

The persisted session state (~/.reqsh_state.json) layout changed. Old state files are not migrated. Start a fresh session after upgrading.