feat(stdlib): ESC-03 — Dict/Map keyed container (stdlib/dict.affine)

[hyperpolymath]

Closes the #229 Dict.t target / STDLIB-03 #162 / ESC-03 #247.

stdlib/dict.affine — keyed associative container over [(String, V)]
(the same representation json::JObject uses, so a decoded JSON object
feeds dict::get directly): empty/from_pairs/get/contains/
size/insert/set/remove/keys/values. module dict;, prelude
only, no host dep — target-agnostic. Dict.t → dict ops.

Recovered from the stranded feat/stdlib-dict-echidna64 draft (whose
branch diff is destructive — only the file is sound). Validated on
current main: check dict.affine → Type checking passed; #136 AOT gate
auto-discovered it (AOT dict.affine [OK]); gate 278→279, zero
regression.

Unblocks the additive, source-compatible Http.affine headers→Dict
upgrade (stdlib/Http.affine:16-18). Refs #162 #247 #229.

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 47 issues detected

Severity	Count
🔴 Critical	12
🟠 High	21
🟡 Medium	14

⚠️ Action Required: Critical security issues found!

View findings

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