Add noun literal syntax: [42], [42 99], [[1 2] 3]

[sigilante]

Summary

• Tokenizer: [ and ] are now self-delimiting characters — emitted as separate word tokens without requiring surrounding whitespace. [CHAR] is special-cased with a 4-char lookahead to stay intact.
• New arms: ++ is-pure-noun, ++ noun-lit-one, ++ noun-lit-list replace the dead ++ parse-noun-tok / ++ parse-cell-items stubs. Pure-noun lookahead checks that all content between [ and the matching ] is only numbers or nested brackets.
• Eval hook: In interpret-mode %word dispatch, [ triggers is-pure-noun lookahead. If pure, the noun literal is expanded to make-atom/make-cell token sequences (from nock.fs) and evaluated. If not pure, falls through to the Tier 14 no-op, preserving [ expr ] LITERAL behaviour.

Examples

[42] get-value       \ → 42 (atom-noun)
[42 99] is-cell?     \ → 1 (true)
[42 99] get-head get-value   \ → 42
[[1 2] 3] get-head is-cell?  \ → 1

Requires make-atom and make-cell from nock.fs to be loaded.

Test plan

• All 288 test-north.sh tests pass (Tiers 0–21 unaffected)
• All 34 test-nock.sh tests pass
• [CHAR] A and [CHAR] 0 still work
• Tier 14 [ expr ] LITERAL still works (3 [ 4 + ] 5 → ~[7])
• [42] get-value → ~[42]
• [42 99] get-head get-value → ~[42]
• [[1 2] 3] get-head get-head get-value → ~[1]

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