Verify the new floor, the doubled-formula branch at the 33-byte
boundary, and that pre-OSAKA pricing is preserved when the gate
is off.

Cover CLZ in [128, 247] to exercise the (byte) cast through
DataWord.of(byte), and pin the IllegalOperationException
when allowTvmOsaka=0.

Make overflow safety explicit instead of relying on int range, and
keep all arithmetic in the new energy helpers consistent with the
existing StrictMathWrapper-based ops.

Activates via ALLOW_TVM_PRAGUE proposal: deploy() installs the
BlockHashHistory bytecode + metadata at the canonical address;
write() propagates parent hashes to a 8191-slot ring buffer.

processBlock writes the parent block hash before iterating
transactions; generateBlock did not, so the producer's simulation
loop saw a stale/empty slot at HISTORY_STORAGE_ADDRESS while
validators saw the live value. Mirror processBlock's call order.

…lockhash

feat(vm): implement TIP-2935 serve historical block hashes from state

…-test-fixes

# Conflicts:
#	framework/src/test/java/org/tron/common/runtime/vm/AllowTvmOsakaTest.java

feat(vm): implement TIP-7939 CLZ opcode

#6692)

feat(vm): implement TIP-7883 ModExp gas cost increase

…trigger processing (#6718)

… and throttling in-flight requests (#6717)

* feat(framework,actuator,common): replace fastjson with jackson

Replace `com.alibaba:fastjson` with Jackson-backed drop-in
wrappers (`org.tron.json.{JSON, JSONObject, JSONArray, JSONException}`).
No external API changes — all HTTP and JSON-RPC responses remain identical.

Motivation:
- Fastjson 1.2.83 is EOL with 20+ CVEs including critical RCE
- Upgrade jackson-databind 2.18.3 → 2.18.6 (GHSA-72hv-8253-57qq)
- Unify JSON handling (previously split between Jackson and Fastjson)

Core changes (common):
- Add org.tron.json wrappers backed by a shared ObjectMapper
- Remove fastjson from common/build.gradle

HTTP & servlet changes (framework):
- Swap imports from com.alibaba.fastjson → org.tron.json across
all HTTP servlets, JSON-RPC layer, and event/log parsers

Test changes:
- Add BaseHttpTest base class for servlet test lifecycle

Build:
- Update jackson to 2.18.6
- Remove fastjson

close #6607

* fix(test): remove trailing whitespace in GetDelegatedResourceAccountIndexV2ServletTest

* test(framework): add buildTransaction test

* refactor(common): tighten TypeUtils visibility and drop unused casts

* refactor(common): mark org.tron.json wrappers as @deprecated

* refactor(common): drop unused JSONException(Throwable) constructor

* test(framework): expand org.tron.json wrapper test coverage

* feat(common,framework): cap JSON parse depth and token count

* fix(common): match Fastjson 1.x NaN/Infinity/NULL behavior

* fix(json): align jackson parser with fastjson defaults

* test(json): remove Fastjson

* fix(json): reject unsupported fastjson edge cases

* test(json): cover duplicate field names

* fix(json): retain single trailing comma support

* refactor(trace): inline program trace json serialization

* fix(test): remove fastjson

* fix(test): use toLowerCase(Locale.ROOT)