chore(main): release 1.0.0

[github-actions]

🤖 I have created a release beep boop

1.0.0 (2026-08-21)

⚠ BREAKING CHANGES

• JustBash.Fs and JustBash.Fs.InMemoryFs are replaced by JustBash.FS / JustBash.FS.Memory with vfs-shaped returns ({:ok, payload, fs} on reads, %VFS.Error{} on failure, %VFS.Stat{} from stat). Bash-level script behavior is unchanged.

Features

• add JustBash.CLI for namespaced subcommand tools (#39) (2761adf)
• add put_context/3 and get_context/3 accessors (#41) (2c6e6b7)
• cli: address consumer feedback from issue #38 (#43) (7d84244)
• replace the filesystem layer with the vfs library (#44) (1da1db8)

Bug Fixes

• /dev/null exists as a filesystem node so operands agree with redirects (#78) (#93) (8619ada)
• a CLI flag rejects unknown spec keys and accepts extra long spellings (#71) (83af599)
• a command whose redirect fails does not run at all (#60) (025673c)
• a flag a command does not implement is an error, not a filename (#72) (9aab27a)
• a trailing slash on a destination requires a directory instead of overwriting the file it names (#75) (5de39ef)
• awk's empty for(;;) condition is true, matching gawk (#87) (ca5c918)
• bound value size so doubling cannot blow past max_wall_ms (#85) (55c0f50), closes #77
• cp into a directory, and make cp -r actually copy (#57) (7d73837)
• date implements %F and -I instead of emitting them literally (#63) (274e86b)
• date rejects unknown arguments instead of returning today at exit 0 (#66) (fd2bb2c)
• exec/2 returns a shell result instead of raising, and always terminates (#73) (3b9be0d)
• grep BRE alternation, missing-path exit code, and flag-level did-you-mean (#84) (3d2c625)
• head default line count no longer emits a trailing blank line (#91) (1bcda6b)
• honour -- as end-of-options for file-operand commands (#89) (b5477c3)
• mkdir and rm report backend errors instead of crashing the exec (#48) (dffd5dd)
• printf %b support and no-progress guard against format-recycle hangs (#50) (56c74b8)
• replace retired earmark runtime dependency with mdex (#55) (ce86847), closes #54
• shasum -c and sha256sum -c read checksums from stdin (#88) (cdddddc)
• tac does not invent a newline on an unterminated last record (#92) (6c92a44)
• writing through a regular file is ENOTDIR, not unreachable state (#56) (1633cdc)

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