docs(changelog): backfill Phase 14a.3 + 14a.4 FFI entries (#26, #27)

[hyperpolymath]

Summary

PRs #26 (shell + fs mkdir_p / copy_file) and #27 (conf JSON loader) both merged today before their CHANGELOG entries landed. This backfills both under [Unreleased] > Added in the same format as the existing Plugin-system (Phase 6) entry.

No code change — CHANGELOG only.

Coverage

Each entry mirrors the depth of the existing Plugin (Phase 6) entry: top-level bolded title with phase + PR number, then sub-bullets covering:

• new / extended files with full FFI export signatures
• capability gating (Shell kind=2, FileSystem kind=0)
• Ephapax wrapper additions in src/core/*.eph
• consumers in the Ephapax-wasm CLI port (cmdDev / cmdBundle for feat(ffi,core): shell spawn/kill + fs mkdir_p/copy_file with .eph wrappers #26; the config-read path for feat(ffi,core): conf — real JSON loader for gossamer.conf.json #27)

Test plan

• CHANGELOG.md still parses as valid markdown
• No code touched — CI test suites unaffected

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 31 issues detected

Severity	Count
🔴 Critical	11
🟠 High	4
🟡 Medium	16

⚠️ Action Required: Critical security issues found!

View findings

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  },
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    "reason": "Issue in security-policy.yml",
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    "reason": "Action hyperpolymath/standards/.github/workflows/governance-reusable.yml@main needs attention",
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    "reason": "Action actions/upload-artifact@v4 needs attention",
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    "reason": "believe_me undermines formal verification (1 occurrences, CWE-704)",
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    "action": "flag",
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    "reason": "believe_me undermines formal verification (1 occurrences, CWE-704)",
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    "action": "flag",
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    "reason": "believe_me undermines formal verification (1 occurrences, CWE-704)",
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    "action": "flag",
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    "reason": "believe_me undermines formal verification (1 occurrences, CWE-704)",
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    "file": "/home/runner/work/gossamer/gossamer/src/interface/abi/HandleLinearity.idr",
    "action": "flag",
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    "reason": "believe_me undermines formal verification (1 occurrences, CWE-704)",
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