fix(jq): follow jq's input stream, per-file names and per-input errors

[chaliy]

Requested by Михайло · project thread

What changed

The jq builtin now handles input the way jq 1.7/1.8 does:

• The filter runs on a shared, lazily consumed input stream, so input and inputs pull the next values. With -n, the filter runs once on null and the whole stream goes to input/inputs. When the stream is empty, input fails with "No more inputs".
• Each file is read on its own. A missing file prints jq: error: Could not open file X: ..., the other files are still processed, and the exit code is 2.
• A runtime error on one input prints jq: error (at <stdin>:N): ... (or file:N) and processing continues with the next input. The exit code is 5.
• A JSON parse error part way through still outputs the values that came before it.
• error("msg") prints unquoted. A non-string thrown value prints (not a string): <json>.
• -e exit status follows the last output.
• -s on empty input gives [].

Why

Adopted from the pseudo-linus Debian oracle bench, where these were the most common jq mismatches against real jq.

Before

$ jq -n '[inputs]' <<< '1 2 3'   →  []
$ jq '.a' <<< '1 {"a":2}'         →  aborts on first error, prints nothing for {"a":2}
$ jq . missing.json ok.json       →  aborts
Oracle bench: jq 67.5% pass

After

$ jq -n '[inputs]' <<< '1 2 3'   →  [1,2,3]
$ jq '.a' <<< '1 {"a":2}'         →  jq: error (at <stdin>:1): Cannot index number with "a"
                                     2   (exit 5)
$ jq . missing.json ok.json       →  error for missing.json, contents of ok.json, exit 2
Oracle bench: jq 74.2% pass

Risk

Low to medium. The change is limited to jq input handling and error formatting. The size-limit error path is unchanged.

Checklist

• Unit and integration tests (positive and negative cases), including differential checks against real jq
• cargo clippy -D warnings, cargo fmt
• Docs (jq.md) and knowledge log updated

https://claude.ai/code/session_01VscpEzxtqpCKx5eRMpywNj

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